A person is proud if he both is and thinks himself to be worthy of great things. If he both is and thinks himself to be worthy of small things he is not proud but temperate, for pride implies greatness. In terms of the vices, a person who thinks himself worthy of great things when he is unworthy of them is vain, whereas a person who thinks himself worthy of less than he is worthy of is pusillanimous. Compared to vanity, pusillanimity is both commoner and worse, and so more opposed to pride.
Although the proud person is an extreme in respect of the greatness of his claims, he is a mean in respect of their truthfulness. He is avid of his just deserts and particularly of honour, the prize of virtue and the greatest of external goods. He is moderately pleased to accept great honours conferred by good people, but he utterly despises honours from casual people and on trifling grounds. As a person who deserves more is better, the truly proud person is good, and as he is good, he is also rare. In sum, pride is a crown of the virtues; it is not found without them, and it makes them greater.
The proud person is liable to disdain and to despise, but as he thinks rightly, he does so justly, whereas the many disdain and despise at random. Although the proud person is dignified towards the great and the good, he is unassuming towards the middle classes; for it is a difficult and lofty thing to be superior to the former, but easy to be so to the latter, and a lofty bearing over the former is no mark of ill-breeding, but among humble people it is as vulgar as a display of strength against the weak.
Again, it is characteristic of the proud man not to aim at the things commonly held in honour, or the things in which others excel; to be sluggish and to hold back except where great honour or a great work is at stake, and to be a man of few deeds, but of great and notable ones. He must also be open in his hate and in his love (for to conceal one’s feelings, i.e. to care less for truth than for what people will think, is a coward’s part), and must speak and act openly; for he is free of speech because he is contemptuous, and he is given to telling the truth, except when he speaks in irony to the vulgar.
Nicomachean Ethics, Book 4