If ... we state the function of man to be a certain kind of life, and this to be an activity or actions of the soul implying a rational principle, and the function of a good man to be the good and noble performance of these, and if any action is well performed when it is performed in accordance with the appropriate excellence ... human good turns out to be activity of the soul in accordance with virtue, and if there are more than one virtue, in accordance with the best and most complete.
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Book I, 1098.a13Aristotle
Excellence is an art won by training and habituation: we do not act rightly because we have virtue or excellence, but we rather have these because we have acted rightly; 'these virtues are formed in man by his doing the actions'; we are what we repeatedly do. Excellence, then, is not an act but a habit: 'the good of man is a working of the soul in the way of excellence in a complete life... for as it is not one swallow or one fine day that makes a spring, so it is not one day or a short time that makes a man blessed and happy'.
Will Durant
For just as for a flute-player, a sculptor, or an artist, and, in general, for all things that have a function or activity, the good and the well is thought to reside in the function, so would it seem to be for man, if he has a function.
Aristotle
The end may be defined as life in accordance with nature or, in other words, in accordance with our own human nature as well as that of the universe.
Zeno of Citium
Now the activity of the practical virtues is exhibited in political or military affairs, but the actions concerned with these seem to be unleisurely. Warlike actions are completely so (for no one chooses to be at war, or provokes war, for the sake of being at war; any one would seem absolutely murderous if he were to make enemies of his friends in order to bring about battle and slaughter); but the action of the statesman is also unleisurely, and-apart from the political action itself-aims at despotic power and honours, or at all events happiness, for him and his fellow citizens-a happiness different from political action, and evidently sought as being different. So if among virtuous actions political and military actions are distinguished by nobility and greatness, and these are unleisurely and aim at an end and are not desirable for their own sake, but the activity of reason, which is contemplative, seems both to be superior in serious worth and to aim at no end beyond itself, and to have its pleasure proper to itself (and this augments the activity), and the self-sufficiency, leisureliness, unweariedness (so far as this is possible for man), and all the other attributes ascribed to the supremely happy man are evidently those connected with this activity, it follows that this will be the complete happiness of man, if it be allowed a complete term of life.
Aristotle
Next in order comes knowledge of the first cause and the subsequent orders of the Gods, then the nature of the world, the essence of intellect and of soul, then providence, fate, and fortune, then to see virtue and formed from them, and from what possible source evil came into the world.
Each of these subjects needs many long discussions; but there is perhaps no harm in stating them briefly, so that a disciple may not be completely ignorant about them.
It is proper to the first cause to be one — for unity precedes multitude — and to surpass all things in power and goodness. Consequently all things must partake of it. For owing to its power nothing else can hinder it, and owing to its goodness it will not hold itself apart.
If the first cause were soul, all things would possess soul. If it were mind, all things would possess mind. If it were being, all things would partake of being. And seeing this quality in all things, some men have thought that it was being. Now if things simply were, without being good, this argument would be true, but if things that are are because of their goodness, and partake in the good, the first thing must needs be both beyond-being and good. It is strong evidence of this that noble souls despise being for the sake of the good, when they face death for their country or friends or for the sake of virtue. — After this inexpressible power come the orders of the Gods.Sallustius (or Sallust)
Aristotle
Arius
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