4. After Aristotle philosophy rapidly declined, and Ethics degenerated into popular moralising which manifested itself chiefly in a growing depreciation of good as the end {42} of life. The conflicting elements of reason and impulse, which neither Plato nor Aristotle succeeded in harmonising, gave rise ultimately to two opposite interpretations of the moral life. The _Stoics_ selected the rational nature as the true guide to an ethical system, but they gave to it a supremacy so rigid as to threaten the extinction of the affections. The _Epicureans_, on the other hand, fastening upon the emotions as the measure of truth, emphasised the happiness of the individual as the chief good--a doctrine which led some of the followers of Epicurus to justify even sensual enjoyment. It is not necessary to dwell upon the details of Epicureanism, for though its description of the 'wise man,' as that of a person who prudently steered a middle course between passion and asceticism, was one which exercised considerable influence upon the morals of the age, it is the doctrines of Stoicism which more especially have come into contact with Christianity. Without discussing the Stoic conception of the world as interpenetrated and controlled by an inherent spirit, and the consequent view of life as proceeding from God and being in all its parts equally divine, we may note that the Stoics, under the influence of Platonism, regarded self-realisation as the true end of man. This idea they expressed in the formula, 'Life according to nature.' The wise man is he who seeks to live in all the circumstances of life in agreement with his rational nature. The law of nature is to avoid what is hurtful and strive for what is appropriate. Pleasure, though not the immediate object of man, arises as an accompaniment of a well-ordered life. Pleasure and pain are, however, really accidents, to be met by the wise man with indifference. He alone is free who acknowledges the absolute supremacy of reason and makes himself independent of earthly desires. This life of freedom is open to all: since all men are members of one body. The slave may be as free as the consul, and in every station of life each may make the world serve him by living in harmony with it.