Pleasure in the job puts perfection in the work.
The energy of the mind is the essence of life.
He who is unable to live in society, or who has no need because he is sufficient for himself, must be either a beast or a god.
Boys should abstain from all use of wine until their eighteenth year, for it is wrong to add fire to fire.
Excellence, then, is a state concerned with choice, lying in a mean, relative to us, this being determined by reason and in the way in which the man of practical wisdom would determine it.
We should behave to our friends as we would wish our friends to behave to us.
It is the mark of an educated mind to rest satisfied with the degree of precision which the nature of the subject admits and not to seek exactness where only an approximation is possible.
In all things of nature there is something of the marvelous.
Therefore, the good of man must be the end of the science of politics.
Misfortune shows those who are not really friends.
All that one gains by falsehood is, not to be believed when he speaks the truth
What the statesman is most anxious to produce is a certain moral character in his fellow citizens, namely a disposition to virtue and the performance of virtuous actions.
It is best to rise from life as from a banquet, neither thirsty nor drunken.
The greatest virtues are those which are most useful to other persons.
Bring your desires down to your present means. Increase them only when your increased means permit.
Men regard it as their right to return evil for evil - and if they cannot, feel they have lost their liberty.
Happiness depends upon ourselves.
All art, all education, can be merely a supplement to nature.
For we do not think that we know a thing until we are acquainted with its primary conditions or first principles, and have carried our analysis as far as its simplest elements.
The whole is more than the sum of its parts.
Those that know, do. Those that understand, teach.
Wicked men obey for fear, but the good for love.
Happiness is an expression of the soul in considered actions.
The activity of happiness must occupy an entire lifetime for one swallow does not a summer make
What is a friend? A single soul dwelling in two bodies.
Every action must be due to one or other of seven causes chance, nature, compulsion, habit, reasoning, anger, or appetite.
Dissimilarity of habit tends more than anything to destroy affection.
No one would choose a friendless existence on condition of having all the other things in the world.
All proofs rest on premises.
Equality consists in the same treatment of similar persons.
Sun Tzu - Lao Tzu - Heraclitus - Confucius - Arthur Schopenhauer - Robert M. Pirsig - Martin Heidegger - Ludwig Wittgenstein - Baruch Spinoza - Amartya Sen