“Once you know some things, you can't unknow them. It's a burden that can never be given away.”

“Once you know a thing you can’t ever unknow it.”

“Once you see some things, you can never forget them. If you don't want to have to see them for the rest of your life, it's better not to look in the first place.”

“If one has given oneself utterly, watching the beloved sleep can be a vile experience. Perhaps some of you have known that paralysis, staring down at features closed to your enquiry, locked away from you where you can never, ever go, into the other’s mind. As I say, for us who have given ourselves, that is a horror. One knows, in those moments, that one does not exist, except in relation to that face, that personality. Therefore, when that face is closed down, that personality is lost in its own unknowable world, one feels completely without purpose. A planet without a sun, revolving in darkness.”

“Time is free, but it's priceless. You can't own it, but you can use it. You can't keep it, but you can spend it. Once you've lost it you can never get it back.”

“You may know that a cascade of water can wear away stone, but you can't predict what shape the rock will take at any given moment.”