Aristotle

Friends are an aid to the young, to guard them from error; to the elderly, to attend to their wants and to supplement their failing power of action; to those in the prime of life, to assist them to noble deeds.

The eyes of some persons are large, others small, and others of a moderate size; the last-mentioned are the best. And some eyes are projecting, some deep-set, and some moderate, and those which are deep-set have the most acute vision in all animals; the middle position is a sign of the best disposition.

We are not angry with people we fear or respect, as long as we fear or respect them; you cannot be afraid of a person and also at the same time angry with him.

Great men are always of a nature originally melancholy.

There was never a genius without a tincture of madness.

The ultimate value of life depends upon awareness and the power of contemplation rather than upon mere survival.

Wishing to be friends is quick work, but friendship is a slow ripening fruit.

Those who educate children well are more to be honored than they who produce them; for these only gave them life, those the art of living well.

The only way to achieve true success is to express yourself completely in service to society.

In poverty and other misfortunes of life, true friends are a sure refuge.

Friendship is a single soul dwelling in two bodies.

... the friendship of worthless people has a bad effect (because they take part, unstable as they are, in worthless pursuits, and actually become bad through each other's influence). But the friendship of the good is good, and increases in goodness because of their association. They seem even to become better men by exercising their friendship and improving each other; for the traits that they admire in each other get transferred to themselves.

My best friend is the man who in wishing me well wishes it for my sake.

The energy or active exercise of the mind constitutes life.

The truly good and wise man will bear all kinds of fortune in a seemly way, and will always act in the noblest manner that the circumstances allow.

Happiness belongs to the self sufficient.

Homer has taught all other poets the art of telling lies skillfully.

Life in the true sense is perceiving or thinking.

If every tool, when ordered, or even of its own accord, could do the work that befits it... then there would be no need either of apprentices for the master workers or of slaves for the lords.

Of the tyrant, spies and informers are the principal instruments. War is his favorite occupation, for the sake of engrossing the attention of the people, and making himself necessary to them as their leader.

Democracy is when the indigent, and not the men of property, are the rulers.