[73] Of existing things, there are some which partake neither of virtue nor of vice; as for instance, plants and irrational animals; the one, because they are destitute of soul, and are regulated by a nature void of sense; and the other, because they are not endowed with mind or reason. But mind and reason may be looked upon as the abode of virtue and vice; as it is in them that they seem to dwell. Some things again partake of virtue alone, being without any participation in any kind of vice; as for instance, the stars, for they are said to be animals, and animals endowed with intelligence; or I might rather say, the mind of each of them is wholly and entirely virtuous, and unsusceptible of every kind of evil. Some things again are of a mixed nature, like man, who is capable of opposite qualities, of wisdom and folly, of temperance and dissoluteness, of courage and cowardice, of justice and injustice, in short of good and evil, of what is honourable and what is disgraceful, of virtue and vice.