But let us return to the subject which we laid aside. Fortune, therefore, by itself, is nothing; nor must we so regard it as though it had any perception, since fortune is the sudden and unexpected occurrence of accidents. But philosophers, that they may not sometimes fail to err, wish to be wise in a foolish matter; and say that she is not a goddess, as is generally believed, but a god. Sometimes, however, they call this god nature, sometimes fortune, “because he brings about,” says the same Cicero, “many things unexpected by us, on account of our want of intelligence and our ignorance of causes.” Since, therefore, they are ignorant of the causes on account of which anything is done, they must also be ignorant of him who does them. The same writer, in a work of great seriousness, in which he was giving to his son precepts of life drawn from philosophy, says, “Who can be ignorant that the power of fortune is great on either side? For both when we meet with a prosperous breeze from her we gain the issues which we desire, and when she has breathed contrary to us we are dashed on the rocks.” First of all, he who says that nothing can be known, spoke this as though he himself and all men had knowledge. Then he who endeavours to render doubtful even the things which are plain, thought that this was plain, which ought to have been to him especially doubtful; for to a wise man it is altogether false. Who, he says, knows not? I indeed know not. Let him teach me, if he can, what that power is, what that breeze, and what the contrary breath.