The evolution of our spirit is blazed on the dark background of eternity by our individual wakes. Every person can, if he/she wishes, leave a more or less brilliant wake behind them.

Philosophy, from the earliest times, has made greater claims, and achieved fewer results, than any other branch of learning.

The purpose of education is to teach a defense against eloquence.

It is undesirable to believe a proposition when there is no ground whatever for supposing it true

Skilled work, of no matter what kind, is only done well by those who take a certain pleasure in it, quite apart from its utility, either to themselves in earning a living, or to the world through its outcome.

Mathematics, rightly viewed, possesses not only truth, but supreme beauty-a beauty cold and austere ... yet sublimely pure and capable of stern perfection such as only the greatest art can show.

Although this may seem a paradox, all exact science is based on the idea of approximation. If a man tells you he knows a thing exactly, then you can be safe in inferring that you are speaking to an inexact man.