Those people have no real interest in a science who only begin to get excited about it when they themselves have made discoveries in it.

It is not doubt,is certitude that drives you mad.

Necessity is not a fact; it's an interpretation.

Only ideas won by walking have any value.

It is not when it is dangerous to tell the truth that its advocates are hardest to find, but when it is boring.

Of all evil I deem you capable: therefore I want the good from you.

How much truth can a spirit bear, how much truth can a spirit dare? ... that became for me more and more the real measure of value.