I will listen to anyone's convictions, but pray keep your doubts to yourself.

The intelligent man finds almost everything ridiculous, the sensible man hardly anything.

Originality provokes originality.

Words are mere sound and smoke, dimming the heavenly light.

No limit, no definition, may restrict the range or depth of the human spirit's passage into its own secrets or the world's.

Superstition is the poesy of practical life; hence, a poet is none the worse for being superstitious.

Mathematicians are like Frenchmen: whatever you say to them they translate into their own language and forthwith it is something entirely different.