I study myself more than any other subject. That is my metaphysics, that is my physics.

I have never seen a greater monster or miracle in the world than myself.

The more I study physics, the more I am drawn to metaphysics.

When I play with my cat, who knows whether she is not amusing herself with me more than I with her.

If you press me to say why I loved him, I can say no more than because he was he, and I was I.

It is a monstrous thing that I will say, but I will say it all the same: I find in many things more restraint and order in my morals than in my opinions, and my lust less depraved than my reason.