189. If a man thus prepares himself, he gives signs of great diligence. On the other hand it is a sign of natural ability, if a man by the power of his mind can foresee the future, and put as it were before his eyes what may happen, and decide what he ought to do if it should take place. It may happen, too, that he will think over two or three things at once, which he supposes may come either singly or together, and that he settles what he will do with them as he thinks will be to the most advantage, in the event of their coming either singly or together.