There is no genius free from some tincture of madness

It is the fault of youth that it cannot restrain its own impetuosity.

But when you are looking on anyone as a friend when you do not trust him as you trust yourself, you are making a grave mistake, and have failed to grasp sufficiently the full force of true friendship.

What you think is the summit is only a step up

A good conscience fears no witness, but a guilty conscience is solicitous even in solitude. If we do nothing but what is honest, let all the world know it. But if otherwise, what does it signify to have nobody else know it, so long as I know it myself? Miserable is he who slights that witness.

I require myself not to be equal to the best, but to be better then the bad.

Epicurus says that you should rather have regard to the company with whom you eat and drink, than to what you eat and drink.