Jesus said: (Mark 2:22) “No one puts new wine into old wineskins; otherwise the wine will burst the skins, and the wine is lost and the skins as well; but one puts new wine into fresh wineskins.”
Jesus said: (John 8:51) “Truly, truly, I say to you, if anyone keeps My word he will never see death.” - Any kind of death, physical or spiritual. New wineskins are needed for the New Wine.
Eating of the Bread of Life (studying Jesus) and being filled with the secrets of immortality is what this temporary life on earth is all about. Endless life is what the nature of life truly is.