To die in order to avoid the pains of poverty, love, or anything that is disagreeable, is not the part of a brave man, but of a coward.

For we do not think that we know a thing until we are acquainted with its primary conditions or first principles, and have carried our analysis as far as its simplest elements.

Here and elsewhere we shall not obtain the best insight into things until we actually see them growing from the beginning.

A great city is not to be confounded with a populous one.

There is no great genius without a mixture of madness.

The greatest virtues are those which are most useful to other persons.

Happiness belongs to the self sufficient.