Wonder is the foundation of all philosophy, inquiry the progress, ignorance the end.

As far as I am concerned, no road that would lead us to health is either arduous or expensive.

A straight oar looks bent in the water. It matters not merely that we see a thing, but how we see it.

It is not necessity but abundance which produces greed.

I put forward formless and unresolved notions, as do those who publish doubtful questions to debate in the schools, not to establish the truth but to seek it.

Examples teach us that in military affairs, and all others of a like nature, study is apt to enervate and relax the courage of man, rather than to give strength and energy to the mind.

If I were a maker of books I should compile a register, with comments, of different deaths. He who should teach people to die, would teach them to live.