text: "But," comes the retort, "you admitted that there is a certain Good of trees and of grass; then surely there can be a certain Good of a child also." But the true Good is not found in trees or in dumb animals the Good which exists in them is called "good" only by courtesy. "Then what is it?" you say. Simply that which is in accord with the nature of each. The real Good cannot find a place in dumb animals – not by any means; its nature is more blest and is of a higher class. And where there is no place for reason, the Good does not exist. There are four natures which we should mention here: of the tree, animal, man, and God. The last two, having reasoning power, are of the same nature, distinct only by virtue of the immortality of the one and the mortality of the other. Of one of these, then – to wit God – it is Nature that perfects the Good; of the other – to wit man – pains and study do so. All other things are perfect only in their particular nature, and not truly perfect, since they lack reason.