Orthodoxy is the diehard of the world of thought. It learns not, neither can it forget.

We can't allow science to undo its own good work.

I want to know what passion is. I want to feel something strongly.

Generalities are intellectually necessary evils.

Great is truth, but still greater, from a practical point of view, is silence about truth.

Children are remarkable for their intelligence and ardor, for their curiosity, their intolerance of shams, the clarity and ruthlessness of their vision.

Several excuses are always less convincing than one.