Certain books seem to be written, not that we might learn from them, but in order that we might see how much the author knows.

Patriotism ruins history.

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

A clever man commits no minor blunders.

I will say with Lorenzo de Medici that those who do not hope for another life are always dead to this one.

The greatest joy of a thinking man is to have searched the explored and to quietly revere the unexplored.

All men would be masters of others, and no man is lord of himself.