Skip navigation.


(384 B.C. - 322 B.C.)


Greek Philosopher, Student of Plato, Teacher of Alexander the Great, Scientist, Explored Physics, Metaphysics, Poetry, Theater, Music, Logic, Rhetoric, Linguistics, Politics, Government, Ethics, Biology and Zoology

A common danger unites even the bitterest enemies.
A king rules as he ought, a tyrant as he lists; a king to the profit of all, a tyrant only to please a few.
A likely impossibility is always preferable to an unconvincing possibility.
A man is his own best friend.
A true friend is one soul in two bodies.
A young man is not a proper hearer of lectures on political science; for he is inexperienced in the actions that occur in life, but its discussions start from these and are about these; and further, since he tends to follow his passions, his study will be vain and unprofitable, because the end aimed at is not knowledge but action. And it makes no difference whether he is young in years or youthful in character; the defect does not depend on time, but on his living, and pursuing each successive object, as passion directs. For to such persons, as to the incontinent, knowledge brings no profit; but to those who desire and act in accordance with a rational principle knowledge about such matters will be of great benefit.
Actual knowledge is identical with its object: in the individual, potential knowledge is in time prior to actual knowledge, but in the universe as a whole it is not prior even in time. Mind is not at one time knowing and at another not. When mind is set free from its present conditions it appears as just what is and nothing more: this alone is immortal and eternal (we do not, however, remember its former activity because while mind in this sense is impassable, mind as passive is destructible), and without it nothing thinks.
All art consists in bringing something into existence.
All arts, that is, all productive forms of knowledge, are potencies; they are originative sources of change in another thing or in the artist himself considered as other.
All friendship is for the sake of good or of pleasure.