KATHOPNISHAD CHAPTER 5 SHLOKA 13

                                                    नित्योऽनित्यानां चेतनश्चेतनानाम् 

                                                    एकोबहूनां योविदधाति कामान् । 

                                                      तमात्मस्थं येऽनुपश्यन्ति धीराः 

                                                  तेषां शान्तिः शाश्वती नेतरेषाम् ॥ १3

                                NITYA  ANITYANAM  CHETANAH  CHETANANAM 

                                     EKA  BAHUNAM  YAH  VIDADHAT  KAMAN |

                               TAM ATMASTHAM YE  ANUPASHYNTI  DGIRAH

                            TESHAM  SHANTIH SHASHVATI  NA ITARESHAM ||13

THE ETERNAL AMONG TRANSIENT,THE CONSCIOUSNESS AMONG CONSCIOUS, ONE

 AMONG MANY,WHO GRANTS THEIR DESIRES.TO THEM WHO PERCEIVES HIM IN SOUL 

                                                       ,IS ETERNAL PEACE ||13

     This is Shloka appears to be similar to the previous ones , but this has something different . The Yamaraj is telling us that the SELF id nonchanging. We were told that in past .Everything in his MORTAL world changes even when we do not perceive the change . The chair that I am sitting on is CHANGING even though I do not see any change from day to day . But if I would see the same chair after year, I will seethe change. So the everything in this world is changing, but the SELF or BRAHMAN is note changing. The second one in this Shloka is that that this is CHETANA in those who have CHETANA. The word CHETANA is translated by different people in different ways. One could say Chetana is LIFE or the Consciousness . Some call it Intelligence  and I don't agree with that. So what makes us ALIVE is what Lord Yama is referring to when he says that this is LIFE in those who are ALIVE or this is CONSCIOUSNESS among those who are Conscious. Without this - the BRANHAN one would not be alive. The next one is related to the same. Yamaraj states that one can fulfill his desires due to THIS BRAHMAN. This is related to life . If there is physical body but no LIFE - dead body- it can not fulfill the desires of the MIND or the subtle body . So when there is connection between the SELF- BRAMHAN- LIFE then and then only the desires of subtle body can be fulfilled and so stated that THIS grants the desires. And lastly Yamaraj states that when one perceives this SELF -CONSCIOUSNESS- BRAHMAN-CHETANA etc. then he becomes eternal - immortal and gets the eternal peace 

   So the BRAHMAN is eternal and it is the cause of life  and due to the Brahman only the physical and subtle bodies can function and when one realizes this he has the peace.