237. We must also guard against the motions of our soul. The soul must always watch and look after itself, so as to guard itself against itself. For there are motions in which there is a kind of passion that breaks forth as it were in a sort of rush. Wherefore in Greek it is called ὁρμή, because it comes out suddenly with some force. In these there lies no slight force of soul or of nature. Its force, however, is twofold: on the one side it rests on passion, on the other on reason, which checks passion, and makes it obedient to itself, and leads it whither it will; and trains it by careful teaching to know what ought to be done, and what ought to be avoided, so as to make it submit to its kind tamer.