Like other philosophies Stoicism had embraced many subjects—logic, including dialectic and rhetoric, physical science, including cosmology and theology, and ethics. But by the first century of the Roman Empire it had become almost exclusively a philosophy of moral and religious edification, well calculated to steel men against the distress and trouble of that age. Its great representatives in this last period were Seneca, Epictetus, and Marcus Aurelius, whose works are still a source of strength for many thoughtful men. Let us now consider briefly the system of the Stoics. Our theme confines us chiefly to the moral and religious sides of their philosophy; but this is only a slight limitation, for true to the teachings of the Cynics, who had greatly influenced the founder of the school, throughout their history the Stoics laid much emphasis on ethics, that is, on the art of a righteous and virtuous life. They were never so much concerned with speculation as to the nature of virtue as with its practice. To them virtue was man’s highest aim, and by it they meant righteousness in the practical relations of life. They defined it as a condition of the soul in which the soul is in continuous harmony with itself. Virtue they subdivided into the four chief elements of intelligence, discretion, courage, and justice. Some also recognized subordinate virtues, but these I name were the four that made up the supreme excellence. Furthermore the Stoics, like Socrates and the Cynics, identified virtue with knowledge and regarded the ideal philosopher as the one who had attained to true and complete wisdom and consequently to perfect virtue. Therefore the ideal of the wise man became the very center of the Stoic doctrine. He was thought to combine in himself all perfection, and as Seneca says, differs from God only by being mortal. As I have already observed, the early Stoics had fixed an absolute gulf between the perfect wise man and the unwise; like the Cynics they had declared that virtue once attained could not be lost; but the practical good sense of a later age modified these extreme views and taught that there were degrees in virtue, and that the most that the ordinary man could do was daily to advance and make progress toward his goal. As Seneca says: “I am not yet wise, nor shall I ever be. Do not ask me to be equal to the best but rather to be better than the base. This is enough for me—to take away daily something from my faults and daily to reject my errors.”[225] That man might attain to virtue, according to the Stoic, he must free himself from the world and its influences, through the exercise of his will he must strive to attain to freedom from all excess of feeling and passion. The extremist said that he must raise himself to a position where he was entirely free from passion, where he had attained to complete ἀπάθεια. The milder Stoics held the view that the wise man would not be one who felt no passion or desire, but rather one in whom virtue