"... We should know them from the moment we are born. But usually we reflect always and only on the death of others. Ah ye, we all have strength enough to bear others' ills. Then the moment comes when we think of death because the illness is our own, and we realize it is impossible to stare directly at the sun and at death. Unless we have had good teachers. I did. Someone said to me that truly few know death. As a rule it is tolerated through stupidity or habit, not through resolve. We die because we cannot do otherwise. Only the philosopher can think of death as a duty, to be performed willingly and without fear. As long as we are here, death is not here, and when death comes, we have gone. Why would I have spent so much time conversing about philosophy if now I were not capable of making my death the masterwork of my life? [...]He told himself that thinking of origins is proper to the philosopher. It is easy for the philosopher to justify death: the we must plunge into obscurity is one of the clearest things in the world. What obsesses the philosopher is not the naturalness of the end, it is the mystery of the beginning. We can lack interest in an eternity that will follow us, but we cannot elude the anguished question of which eternity preceded us: the eternity of matter or the eternity of God?"
January 1, 1970
https://en.wikiquote.org/wiki/The_Island_of_the_Day_Before