Seneca is fond of contrasting the sage with the proficient. The sage is like a man in the enjoyment of perfect health. But the proficient is like a man recovering from a severe illness, with whom an abatement of the paroxysm is equivalent to health, and who is always in danger of a relapse. It is the business of philosophy to provide for the needs of these weaker brethren. The proficient is still called a fool, but it is pointed out that he is a very different kind of fool from the rest. Further, proficients are arranged into three classes, in a way that reminds one of the technicalities of Calvinistic theology. First of all, there are those who are near wisdom, but, however near they may be to the door of Heaven, they are still on the wrong side of it. According to some doctors, these were already safe from backsliding, differing from the sage only in not having yet realized that they had attained to knowledge; other authorities, however, refused to admit this, and regarded the first class as being exempt only from settled diseases of the soul, but not from passing attacks of passion. Thus did the Stoics differ among themselves as to the doctrine of "final assurance". The second class consisted of those who had laid aside the worst diseases and passions of the soul, but might at any moment relapse into them. The third class was of those who had escaped one mental malady but not another; who had conquered lust, let us say, but not ambition; who disregarded death, but dreaded pain, This third class, adds Seneca, is by no means to be despised. From these concessions to the weakness of humanity we now pass to the Stoic paradoxes, where we shall see their doctrine in its full rigor. It is perhaps these very paradoxes which account for the puzzled fascination with which Stoicism affected the mind of antiquity, just as obscurity in a poet may prove a surer passport to fame than more strictly poetical merits. The root of Stoicism being a paradox, it is not surprising that the offshoots should be so too. To say that "Virtue is the highest good" is a proposition to which every one who aspires to the spiritual life must yield assent with his lips, even if he has not yet learned to believe it in his heart. But alter it into "Virtue is the only good" and by that slight change it becomes at once the teeming mother of paradoxes. By a paradox is meant that which runs counter to general opinion. Now it is quite certain that men have regarded, do regard, and, we may safely add will regard things as good which are not virtue. But if we grant this initial paradox, a great many others will follow along with it--as for instance that "Virtue is sufficient of itself for happiness". The fifth book of Cicero's _Tusculan Disputations_ is an eloquent defense of this thesis, in which the orator combats the suggestion that a good man is not happy when he is being broken on the wheel.