Too rigid scruples are concealed pride.

At all times it has not been the age, but individuals alone, who have worked for knowledge. It was the age which put Socrates to death by poison, the age which burnt Huss. The ages have always remained alike.

Go to the place where the thing you wish to know is native; your best teacher is there. Where the thing you wish to know is so dominant that you must breathe its very atmosphere, there teaching is moat thorough, and learning is most easy. You acquire a language most readily in the country where it is spoken; you study mineralogy boat among miners; and so with everything else.

Where a man has a passion for meditating without the capacity of thinking, a particular idea fixes itself fast, and soon creates a mental disease.

One should not wish anyone disagreeable conditions of life; but for him who is involved in them by chance, they are touchstones of characters and of the most decisive value to man.

I respect the man who knows distinctly what he wants.

When I consider the narrow limits within which our active and inquiring faculties are confined; when I see how all our energies are wasted in providing for mere necessities, which again have no further end than to prolong a wretched existence; and then that all our satisfaction concerning certain subjects of investigation ends in nothing better than a passive resignation... when I consider all this... I am silent.