HKB
in accord with nature. In the individual it is virtue alone which enables him to do this; as Providence rules the universe, so virtue in the soul must rule man.
In Logic, the Stoic system is noteworthy for their theory as to the test of truth, the Criterion. They compared the new-born soul to a sheet of paper ready for writing. Upon this the senses write their impressions (φαντασίαι), and by experience of a number of these the soul unconsciously conceives general notions (κοιναὶ ἔννοιαι) or anticipations (προλήψεις). When the impression was such as to be irresistible it was called (καταληπτικὴ φαντασία) one that holds fast, or as they explained it, one proceeding from truth. Ideas and inferences artificially produced by deduction or the like were tested by this 'holding perception.' Of the Ethical application I have already spoken. The highest good was the virtuous life. Virtue alone is happiness, and vice is unhappiness. Carrying this theory to its extreme, the Stoic said that there could be no gradations between virtue and vice, though of course each has its special manifestations. Moreover, nothing is good but virtue, and nothing but vice is bad. Those outside things which are commonly called good or bad, such as health and sickness, wealth and poverty, pleasure and pain, are to him indifferent (ἀδιάφορα). All these things are merely the sphere in which virtue may act. The ideal Wise Man is sufficient unto himself in all things (αὐταρκής); and knowing these truths, he will be happy even when stretched upon the rack. It is probable that no Stoic claimed for himself that he was this Wise Man, but that each strove after it as an ideal much as the Christian strives after a likeness to Christ. The exaggeration in this statement was, however, so obvious, that the later Stoics were driven to make a further subdivision of things indifferent into what is preferable (προηγμένα) and what is undesirable (ἀποπροηγμένα). They also held that for him who had not attained to the perfect wisdom, certain actions were proper. (καθήκοντα) These were neither virtuous nor vicious, but, like the indifferent things, held a middle place.
Two points in the Stoic system deserve special mention. One is a careful distinction between things which are in our power and things which are not. Desire and dislike, opinion and affection, are within the power of the will; whereas health, wealth, honour, and other such are generally not so. The Stoic was called upon to control his desires and affections, and to guide his opinion; to bring his whole being under the sway of the will or leading principle, just as the universe is guided and governed by divine Providence. This is a special application of the favourite Greek virtue of moderation, (σωφροσύνη) and has also its parallel in Christian ethics. The second point is a strong insistence on the unity of the universe, and on man's duty as part of a great whole. Public spirit was the most splendid political virtue of the ancient world, and it is here made cosmopolitan. It is again instructive to note that Christian sages insisted on the same thing. Christians are taught that they are members of a worldwide brotherhood, where is neither Greek nor Hebrew, bond nor free and that they live their lives as fellow-workers with God.