He who is firm and resolute in will molds the world to himself.

The credit of advancing science has always been due to individuals and never to the age.

Things which matter most must never be at the mercy of things which matter least.

You acquire a language most readily in the country where it is spoken; you study mineralogy best among miners; and so with everything else.

Hypotheses are only the pieces of scaffolding which are erected round a building during the course of construction, and which are taken away as soon as the edifice is completed.

No one knows what he is doing so long as he is acting rightly; but of what is wrong one is always conscious.

First let a man teach himself, and then he will be taught by others.