Learn why the world wags and what wags it. That is the only thing which the mind can never exhaust, never alienate, never be tortured by, never fear or distrust, and never dream of regretting. Learning is the only thing for you. Look what a lot of things there are to learn.

The best thing for being sad, is to learn something. That's the only thing that never fails ... Learning is the only thing for you. Look what a lot of things there are to learn.

Only fools want to be great.

The most difficult thing in the world is to know how to do a thing and to watch someone else do it wrong without comment.

It is the bad people who need to have principles to restrain them.

If there is one thing I can't stand, it is stupidity. I always say that stupidity is the Sin against the Holy Ghost.

We find that at present the human race is divided politically into one wise man, nine knaves, and ninety fools out of every hundred. That is, by an optimistic observer. The nine knaves assemble themselves under the banner of the most knavish among them, and become politicians; the wise man stands out, because he knows himself to be hopelessly out-numbered, and devotes himself to poetry, mathematics or philosophy; while the ninety fools plod off behind the banners of the nine villains, according to fancy, into the labyrinths of chicanery, malice and warfare.