Nervous states of the worst sort control me without pause. Everything that is not literature bores me and I hate it. I lack all aptitude for family life except, at best, as an observer. I have no family feeling and visitors make me almost feel as though I were maliciously being attacked.

You can choose to be free , but it's last decision you'll ever make

Every new discovery is assumed at once into the sum total of knowledge, and with that ceases in a sense to be a discovery; it dissolves into the whole and disappears, and one must have a trained scientific eye even to recognize it after that.

I answer one of your letters, then lie in bed in apparent calm, but my heart beats through my entire body and is conscious only of you. I belong to you; there is really no other way of expressing it, and that is not strong enough.

I like to make use of what I know

It receives you when you come and dismisses you when you go.

There art two cardinal sins from which all others spring: Impatience and Laziness.