For the things we have to learn before we can do them, we learn by doing them.

Freedom is obedience to self-formulated rules.

The pleasures arising from thinking and learning will make us think and learn all the more. 1153a 23

These virtues are formed in man by his doing the actions ... The good of man is a working of the soul in the way of excellence in a complete life.

Without friends, no one would want to live, even if he had all other goods.

A man without regrets cannot be cured.

One can with but moderate possessions do what one ought.

Life in accordance with intellect is best and pleasantest, since this, more than anything else, constitutes humanity.

Happiness seems to depend on leisure, because we work to have leisure, and wage war to live in peace.

The beginning seems to be more than half of the whole.

Leadership is the art of intentional living.

How can it be that mathematics, being after all a product of human thought which is independent of experience, is so admirably appropriate to the objects of reality?

You can't change people, but most importantly, unless you're their momma, you don't even know what's best for them.

The reality is you do not know exactly what is likely to occur tomorrow. Lifetime can be a ridiculous trip, and practically nothing is confirmed.

I can appreciate anybody's passion for anything.

Do not be afraid to be afraid.

For peace, with justice and honor, is the fairest and most profitable of possessions, but with disgrace and shameful cowardice, it is the most infamous and harmful of all.

To study history is to study literature.

The next time you get nervous about others opinions, look them mentally in the eye and say, "What you think of me is none of my business."

This sense of power is the highest and best of pleasures when the belief on which it is founded is a true belief, and has been fairly earned by investigation.