Every man is indeed bound to do what he can to promote the good of others, and a man who is of no use to anyone is strictly worthless.

The chief cause of human errors is to be found in the prejudices picked up in childhood.

And I shall always hold myself more obliged to those by whose favour I enjoy uninterrupted leisure than to any who might offer me the most honourable positions in the world.

Travelling is almost like talking with those of other centuries.

...it is certain that I am really distinct from my body, and can exist without it.

Although my knowledge grows more and more, nevertheless I do not for that reason believe that it can ever be actually infinite, since it can never reach a point so high that it will be unable to attain any greater increase.

I am thing that thinks: that is, a things that doubts,affirms, denies, understands a few things, is ignorant of many things, is willing, is unwilling, and also which imagines and has sensory perceptions.