There are but very few men clever enough to know all the mischief they do.

An explanation of cause is not a justification by reason.

I was so ashamed of who I was.

Of all that is written, I love only what a person has written with his own blood.

The word 'belief' is a difficult thing for me. I don't believe. I must have a reason for a certain hypothesis. Either I know a thing, and then I know it - I don't need to believe it.