The most perfidious way of harming a cause consists of defending it deliberately with faulty arguments.

Not the intensity but the duration of high feelings makes high men.

In magnanimity there is the same amount of egoism as in revenge, but egoism of a different quality.

We criticize a man or a book most sharply when we sketch out their ideal.

The same passions in man and woman nonetheless differ in tempo; hence man and woman do not cease misunderstanding one another.

Science offends the modesty of all real women. It makes them feel as though it were an attempt to peek under their skin--or, worseyet, under their dress and ornamentation!

Mathematics would certainly have not come into existence if one had known from the beginning that there was in nature no exactly straight line, no actual circle, no absolute magnitude.