Aristotle

Thou wilt find rest from vain fancies if thou doest every act in life as though it were thy last.

Even when laws have been written down, they ought not always to remain unaltered.

The young are permanently in a state resembling intoxication.

Therefore, the good of man must be the end of the science of politics.

Men create gods after their own image, not only with regard to their form but with regard to their mode of life.

If one way be better than another, that you may be sure is nature's way.

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.

The end of labor is to gain leisure.

Bad men are full of repentance.

I have gained this from philosophy: that I do without being commanded what others do only from fear of the law.

The secret to humor is surprise.

In all things of nature there is something of the marvelous.

The educated differ from the uneducated as much as the living from the dead.

Plato is dear to me, but dearer still is truth.

Youth is easily deceived because it is quick to hope.

All men by nature desire knowledge.

Republics decline into democracies and democracies degenerate into despotisms.

Poetry is finer and more philosophical than history; for poetry expresses the universal, and history only the particular.

Politicians also have no leisure, because they are always aiming at something beyond political life itself, power and glory, or happiness.

Change in all things is sweet.

Courage is the first of human qualities because it is the quality which guarantees the others.