The problem of pretending to be alive.

However great a man's fear of life, suicide remains the courageous act, the clear-headed act of a mathematician. The suicide has judged by the laws of chance - so many odds against one that to live will be more miserable than to die. His sense of mathematics is greater than his sense of survival. But think how a sense of survival must clamor to be heard at the last moment, what excuses it must present of a totally unscientific nature.

We can love with our minds, but can we love only with our minds? Love extends itself all the time, so that we can love even with our senseless nails: we love even with our clothes, so that a sleeve can feel a sleeve.

One forgets so quickly one's own youth.

You don't bless what you love...It's when you want to love and you can't manage it. You stretch out your hands and you say God forgive me that I can't love but bless this thing anyway...We have to bless what we hate...It would be better to love, but that's not always possible.

He was like a child with haemophilia: every contact drew blood.

A single feat of daring can alter the whole conception of what is possible.