KATHOPNISHADA CHAPTER 1 SHLOKA 25

                                                    ये ये कामा दुर्लभा मर्त्यलोके

                                                    सर्वान् कामाँश्छन्दतः प्रार्थयस्व ।

                                                    इमा रामाः सरथाः सतूर्या

                                                    न हीदृशा लम्भनीया मनुष्यैः ।|

                                                  आभिर्मत्प्रत्ताभिः परिचारयस्व

                                                  नचिकेतोमरणं माऽनुप्राक्षीः ॥ २५

                                   YE YE KAMA DURLABHA MARTYALOKE

                           SARVAN KAMAN CHHANDATAH PRARTHYASWA

                                      IMA RAMAH SARATHAH SATURYA

                             NA HIDRASHA LAMBHANIYA MANUSHYEH

                            ABHIR MAT PRATTABHIH PARICHARAYASWA

                               NICHIKETOMARANAM MANUPRAKSHIH ||25

      WHATEVER DESIRES ARE DIFFICULT TO ATTAIN BY MORTALS IN MORTAL LIFE              LIKE  CHARIOTS , MUSIC, THAT CAN NOT BE ENJOYED BY MORTALS, ASK FOR               THEM,I WILL GIVE THEN TO YOU,O NACHIKETA DO NOT ASK FOR STATE OF SOUL                                                                     AFTER DEATH || 25

   This is again continuation of the theme that has been seen in last few Shloka. The Yama is offering different things to Nachiketa  and asking him to ask for something else , rather than insisting on KNOWING the state of soul after Death. This time he is offering things that Mortals can not get or get it easily on Earthly Life . The Earth is called MRYTYULOK. MRUTYU means death .LOKA means PLACE. In Vedic religion there are 7 LOKAS and Earth is one of them .BHU, BHYVAH, SWAHA ,MAHA ,JANAH,TAPAH, SATYA  - are the 7 places or LOKA. So each place has some 'limits' as to what can be enjoyed . So Yama is offering him some of the rare things seen in  present life . Chariots  and musical instrument may sound not great for some one now . But it is like offering Ferrari or Lamborghini automobiles in today's society.

KATHOPNISHADA CHAPTER 1-SHLOKA 24

     
                                                          एतत्तुल्यं यदि मन्यसेवरं

                                                        वृणीष्व वित्तं चिरजीविकां च ।

                                                         महाभूमौनचिकेतस्त्वमेधि

                                                   कामानां त्वा कामभाजं करोमि ॥ २४
 
                                    ETATAT TULYAM  TADI MANYASE VARAM

                                    VRUNISVA VITTAM CHIRAJIVIKAM CH |

                                   MAHABHUMAU NACHIKETAS TWAM EDHI

                                  KAMANAMTWAM KAMA BHAJAM KAROMI ||24

   IF YOU THINK ANY OTHER BOON EQUAL TO THIS BOON,WEALTH, LONGEVITY,

                   KING OF LARGE PORTION OF LAND / EARTH, O  NACHIKETA 

                                         I  CAN MAKE  YOU  ENJOY ||24

   This Shloka is continuation of temptation that is offered by the Lord of Death. One may feel why is he offering all these different things rather than explaining the Life After Death? The answer may be that many of us try to KNOW the answer and get caught at lower level of achievement. As was stated in Patnajali Sutra Yoga, when one starts to do meditation and has some success in it , he will get certain Powers or Sidhhi  and then if one gets entangle in them , by Enjoying the fruits of these powers, then he will not advance  and will not KNOW the knowledge. If we think of these different means as steps of a ladder, MANY OF US GET CAUGHT IN LOWER STEPS ONLY  and never reach the top of ladder. So the temptation that Lord of Death,, so to make sure that the Student is ready and not going to drop out.
    So he is offering him different Pleasures that ARE ALL RELATED TO MORTAL BODY.and sense organ pleasure. So one can see through this . All the offering are related to the enjoyment in THIS WORLD  and nothing to do with OTHER WORLD.

KATHOPNISHADA CHAPTER 1- SHLOKA 23

                                                         शतायुषः पुत्रपौत्रान्वृणीष्वा

                                                       बहून्पशून् हस्तिहिरण्यमश्वान् ।

                                                          भूमेर्महदायतनं वृणीष्व

                                                       च जीव शरदोयावदिच्छसि ॥ 23

                             SHATAYUSHAH PUTRA PAUTRAN VRUNISHVA

                             BAHUM PASHUN HASTI HIRANYAM ASHWAN |

                               BHUMER MAHAD AYATANAM VRUNISHVA

                             SWAYAM CH JIV SHARADO YAVAD ICHHASI ||23

(YAMA SAID) ASK FOR SONS  AND GRANDSONS WHO MAY LIVE FOR HUNDREDS OF YEARS  AND HEARD OF CASTLES ,ELEPHANTS  AND HORSES .CHOOSE THE ENTIRE  EARTH TO BE YOUR RESIDENCE FOR AS MANY AUTUMNS AS YOU WISH ||23

   This is also continuation of God of Death telling Nachiketa to ask for something else , other  than
KNOWLEDGE of what happens after Death.I think what is implied in theses Shlokas is that at every stage of our life we have a choice  and most of us make MORTAL choices. There are 4 Purusharth ARTH -KAMA -DKARMAND MOKSHA . Moksha is the last one . The ARTH IS MAKING MONEY, KAMA IS FULFILLING DESIRES ,DHARMA IS DOING OUT DESIGNATED DUTIES  AND MOKSHA IS ETERNITY .
  I do not need to explain on making money. The Kama is not SEX as many think die to various reasons - KAMADEV God of sex, Kamasutra  describing various ways of making physical love  etc . But there is broader meaning of Kama . One that makes our sense organs happy would be the better meaning . So it may be sex or eating or drinking or listening to music etc The Dharma means our duties . In this life we have different Duties - such as son or daughter  brother or sister, husband or wife - these ar at personal levels in our family. But in our outside world , we have duties as neighbor, friend, employees or employer, citizen etc. We also have some duties towards the society .But in addition to these duties the Dharma also means to DO THINGS WHICH ARE MORALS . Making money or having a marriage or  having sex - as long as it is done morally , we are OK
    So in this Shloka the God of Death is asking Nachiketa to ask for any of these as most of us STOP t that levels only . Achieving NIRVAN or Moksha is like climbing a ladder . There are steps  and by climbing on these rungs we get closure to the Mokasha . But most of us get entangled at lower levels of ARTH -KAMA AND MAY BE DHARM . So he is offering all the temptations that we all fall for most of the times in most of our lives.
    So in short He is offering the temptations to see how firm the student -Nachiketa - in his desire to KNOW.

KATHOPNISHADA CHAPTER 1 SHLOKA-22

                 
                                                  देवैरत्रापि विचिकित्सितं किल त्वं

                                                         च मृत्योयन्न सुज्ञेयमात्थ ।

                                                   वक्ता चास्य त्वादृगन्यो न लभ्यो

                                                   नान्योवरस्तुल्य एतस्य कश्चित् ॥ २२

                                  DEVAIR ATRAPI VICHIKITSIAM KIL TVAM

                                   CHA MRUTYO YANNA SUVIDYEAM AATTHAM |

                                   VAKTA CHA ASYA TVADRG ANYO NA LABHYO

                                  NANYO VARASTULYA ETASYA KASCHIT ||22

               OH GOD OF DEATH, YOU SAY THAT EVEN GODS HAVE DOUBTS

ABOUT THIS (QUESTION), SO WOULD BE BETTER TO TELL THAN YOU (ABOUT THIS)

AND NO OTHER BOON CAN BE EQUAL TO THIS (ANSWERING MY QUESTION) -22

         This is simple one  and not much can be added to the straight meaning . Nachiket was tempted by Yam to ask for something else, but he does not want anything else  and wants the answer . Lord of death - YAMA will be the best or mos suitable person to answer as to what happens after death.So Nachiket is insisting though politely that Yama should teach him as to what happens after death and he does not want any other boon . 

KATHOPNISHAD CHAPTER 1 SHLOKA -21

               
                                                     देवैरत्रापि विचिकित्सितं पुरा
     
                                                      न हि सुविज्ञेयमणुरेष धर्मः ।

                                                      अन्यं वरं नचिकेतोवृणीष्व

                                                     मा मोपरोत्सीरति मा सृजैनम् ॥ २1
                                 
                                      DEVE ATRAPI VICHKITSITAM POORA

                                 NA HI SUVDHYEYAMANURESH DHARMH

                               ANYAM VARAM NACHIKETO VRUNISHWA

                                  MA MA UPAROTSI R MA SRUJAINAM ||21

EVEN THE GODS HAVE DOUBTS ON THIS (TOPIC) AS IT IS NOT EASY TO UNDERSTAND

                   BEING SUBTLE, OH NACHIKETA CHOOSE ANOTHER BOON,

                            DO NOT PRESS ME ON THIS, GIVE UP THIS ONE ||21

         This is a straight forward Shloka.
         Nachiket asked to know about life after death  and so it is a subject where many and most will not be interested or understand or appreciate . It will put most of us to sleep. So the Yama wants to make sure that the student is anxious enough to KNOW. Many of have questions , but we do not have ability or patients or time to really make efforts for the reaching higher levels. We all have seen this in our life. We attend spiritual lectures  and gave questions , but we do not work for it - practicing YAMA, NIYAMA, MEDITATIONS etc . We all want instant satisfaction. So Lord of Death wants to make sure that Nachiket , the mortal is READY for the discourse. Even in Ganapati Atharvshirsh,it is stated that Do not give this Stotra to wrong student.
       It is also possible that Yama wants to make sure that Nachiket HAS INTENSE DESIRE CALLED ART IN SANSKRIT, There is story . There was a teacher who had a student who was not following usual regular practices to achieve the highest levels of Samadhi. He was asking the teacher as when will he see the God . One day the teacher went to to a river for bathing  and doing morning prayers. The student accompanied him and had the same question. The teacher  and the student were in the waters . The teacher pressed the head of the student under water . The student started struggling  and the teacher continued to press it down . After short time , the teacher allowed him to get his head out of water  and breath. The student was surprised and asked teacher as to why did he do this. The teacher answered, "When his desire to see GOD would be as intense as was to breath under water , he will see God."

KATHOPNISHADA CHAPTER 1 SHLOKAS- 20

                                                      येयं प्रेतेविचिकित्सा मनुष्येऽ

                                                       अस्तित्वे के नायमस्तीति चैके ।

                                                         एतद्विद्यामनुशिष्टस्त्वयाऽहं

                                                         वराणामेष वरस्तृतीयः ॥ २0

                                        YEYAM  PRETE VICHIITSA MANUSHYE

                                        ASTI ITI EKE NA AYAM ASTI ITI CHEKE |

                                              ETAT VIDYA ANISHISHTA TWAYA

                                             AHAM VARANAMESH VAR TRUTIY || 20

THERE IS DISCUSSION WHEN MAN (LIVING)DIES , SOME SAY HE IS THERE AND SOME 
      SAY IS NOT THERE .AS MY THIRD BOON I WOULD LIKE YOU KNOW FROM YOU||20

   This the REAL question that will be answered in this UPANISHADA. What happens after the so called death of the physical body . No one thinks that dead body is a alive person . The discussion that occurs among the people that are still living physically as to when some one dies is ANYTHING left. As one can imagine there are various thoughts about life after death. Some feel this is it . There is no existence after physical body dies . On the other hand many believe that there is after life. The Vedic religion has reincarnation and other Abrahamic religions - Christianity , Judaism and Muslim religion have different thought process about existence after the death of physical body . The Atheist  do not believe in life after death.  So Nachiketa is asking his third boon and wants to know about the life after death  and who could be the best teacher ,none other than God of Death - the YAMA.
   There are many thoughts about the after life  and we don't need to discuss them here . But something else to note is that Nachiketa has asked his Boon in order of what WE SHOULD behave  In the first boon he asked for his family -he wanted to see his father happy ,In the second boon he asked for the welfare of the general public and when that is done then only he asked for the HIMSELF.

KATHOPNISHADA CHAPTER 1 SHLOKA - 18

                   
                                                              त्रिणाचिकेतस्त्रयमेतद्विदित्वा

                                                            य एवं विद्वाँश्चिनुतेनाचिकेतम् ।

                                                              स मृत्युपाशान् पुरतः प्रणोद्य

                                                              शोकातिगोमोदतेस्वर्गलोके ॥ १८

                                                 TRINACHIKET TRAYA ETAT VIDITWA

                                           YA EVAM VIDWAN CHINUTE NACHIKETAM |

                                                SA MRUTYUPASHAT PURAT PRANODYA

                                                 SHOKATIGAH MODATE SWARGALOKE ||18

ONE WHO KNOWS THE THREE NACHIKETA-FIRE WITH KNOWLEDGE ,THROWS OFF

THE CHAINS OF DEATH GOES SORROW AND ENJOYES HAPPINESS IN HEAVEN ||18

          These Shlokas are repetition of the things that have been said. The Lord of Death had told Nachiketa that the Sacrificial ceremony - the Yadnya will be called Nachiketa - fire.We are told that when one does this Yadnya or the Sacrifice three times  and does it with knowledge , will enjoy the pleasures of the heaven. In this Shloka also there is mention of three.and also mention of the KNOWLEDGE in addition to the FIRE ceremony. So I do believe that the Lord specificaly wants to make sure that just knowledge of doing the Fire ceremony -Yadnya , like how to set the bricks  and how many are needed  and how to do the Mantras , is not as important as the KNOWLEDGE of the BRAMHAM. Again by repeating the three, I think the Lord wants us to know that one can not reach highest level just once , but maust continue.
    When one starts meditation, he starts having some SIDHHI or powers  and these could be as simple as knowing something that one can not know ordinarily.If I am in US  and I could know what happened in India without having direct contact with person there.Mind reading  and many other powers which are described to some extent in PATANJALI SUTRA YOGA. But having these powers is a trap. If one gets  entangled in these powers, then one forgets to get to the highest levels  and so just achieving the highest level once is not enough . Again this is open to interpretations.