No man is so foolish but he may sometimes give another good counsel, and no man so wise that he may not easily err if he takes no other counsel than his own. He that is taught only by himself has a fool for a master.

If you can keep your wits about you while all others are losing theirs, and blaming you. The world will be yours and everything in it, what's more, you'll be a man, my son.

[Once plans for each eventuality are resolved, further] Worry never robs tomorrow of its sorrow, but only saps today of its strength.

That man is wisest who, like Socrates, realizes that his wisdom is worthless

There is such a thing as the poetry of a mistake, and when you say, "Mistakes were made," you deprive an action of its poetry, and you sound like a weasel.

If thou wilt be observant and vigilant, thou wilt see at every moment the response to thy action. Be observant if thou wouldst have a pure heart, for something is born to thee in consequence of every action.