The best and purest human beings, from the beginning of time, have understood that life is sacred.

I see that I've become a really bad correspondent. It's not that I don't think of you. You come into my thoughts often. But when you do it appears to me that I owe you a particularly grand letter. And so you end in the "warehouse of good intentions": "Can't do it now." "Then put it on hold." This is one's strategy for coping with old age, and with death--because one can't die with so many obligations in storage. Our clever species, so fertile and resourceful in denying its weaknesses.

I am something of a crank about sleep, for if I get seven and a quarter hours instead of eight I feel afflicted and drag myself around, although there's nothing really wrong with me. It's just another idea. That's how it is with my ideas; they seem to get strong while I weaken.

... an era of turmoil and ideological confusion, the principal phenomenon of the present age.

I immersed myself in The Periodic Table gladly and gratefully. There is nothing superfluous here, everything this book contains is essential. It is wonderful pure, and beautifully translated...I was deeply impressed.

Death deserves dignity.

Socrates said the unexamined life is not worth living. But the over-examined life makes you wish you were dead. Given the alternative, I'd rather be living.