Theories are private property, but truth is common stock.

None are so seldom found alone, and are so soon tired of their own company, as those coxcombs who are on the best terms with themselves.

It is with antiquity as with ancestry, nations are proud of the one, and individuals of the other; but if they are nothing in themselves, that which is their pride ought to be their humiliation.

The science of mathematics performs more than it promises, but the science of metaphysics promises more than it performs.

How small a portion of our life it is that we really enjoy! In youth we are looking forward to things that are to come; in old age we are looking backward to things that are gone past; in manhood, although we appear indeed to be more occupied in things that are present, yet even that is too often absorbed in vague determinations to be vastly happy on some future day when we have time.

There is more jealousy between rival wits than rival beauties, for vanity has no sex. But in both cases there must be pretensions, or there will be no jealousy.

A hug is worth a thousand words.