The business of philosophy is not to give rules, but to analyze the private judgments of common reason.

That Logic has advanced in this sure course, even from the earliest times, is apparent from the fact that, since Aristotle, it has been unable to advance a step, and thus to all appearance has reached its completion.

The instruction of children should aim gradually to combine knowing and doing. Among all sciences mathematics seems to be the only one of a kind to satisfy this aim most completely.

Often war is waged only in order to show valor; thus an inner dignity is ascribed to war itself, and even some philosophers have praised it as an ennoblement of humanity, forgetting the pronouncement of the Greek who said, 'War is an evil in as much as it produces more wicked men than it takes away.'

No state at war with another state should engage in hostilities of such a kind as to render mutual confidence impossible when peace will have been made.

We are not rich by what we possess but by what we can do without.

It is not necessary that whilst I live I live happily; but it is necessary that so long as I live I should live honourably.