For the things we have to learn before we can do, we learn by doing.
Nicomachean Ethics, Book II, tr. W. D. Ross
Any one can get angry, that is easy... but to do this to the right person, to the right extent, at the right time, with the right motive, and in the right way, that is not for every one, nor is it easy.
Nicomachean Ethics, Book II, tr. W. D. Ross
For one swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.
Nicomachean Ethics, Book I, tr. W. D. Ross
Without friends no one would choose to live, though he had all other goods.
Nicomachean Ethics, Book VIII
When people are friends, they have no need of justice, but when they are just, they need friendship in addition.
Nicomachean Ethics, Book VIII
What it lies in our power to do, it lies in our power not to do.
Nicomachean Ethics, Book III
Our characters are the result of our conduct.
Nicomachean Ethics, Book III
The roots of education are bitter, but the fruit is sweet.
Quoted in Diogenes Laertius, Lives of Eminent Philosophers
A friend is one soul abiding in two bodies.
Quoted in Diogenes Laertius, Lives of Eminent Philosophers