=Problem of Control of Affections and Desires.=--If it is the lively movements of natural appetites and desires which make the individual apprehend false goods as true ones, and which present obstacles to knowledge of the true good, the serious problem is evidently to check and so far as possible to abolish the power of desire to move the mind. Since it is anger, fear, hope, despair, sexual desire which make men regard particular things instead of the final end as good, the great thing is wholly to free attention and judgment from the influence of such passions. It may be impossible to prevent the passions; they are natural perturbations. But man can at least prevent his judgment of what is good or bad from being modified by them. The Stoic moral philosophers most emphasized the misleading influence of desire and passion, and set up the ideal of apathy (lack of passion) and "ataraxy" (absence of being stirred up). The other moral schools, the Sceptics and Epicureans, also made independence of mind from influence of passion the immediate and working end; the Sceptics because they emphasized the condition of mental detachment and non-committal, which is the state appropriate to doubt and uncertainty; the Epicureans because the pleasures of the mind are the only ones not at the mercy of external circumstances. Mental pleasures are equable, and hence are the only ones which do not bring reactions of depression, exhaustion, and subsequent pain. The problem of moral theory is now in effect, if not in name, that of _control_, of authority and subordination, of checking and restraining desire and passion. =Problem of Control of Private Interests by Law.=--Such views could at the best, however, affect only a comparatively small number, the philosophers. For the great masses of men in the Roman Empire, the problem existed on the other line: by what laws and what administration of laws to direct the outward acts of men into right courses, courses at least sufficiently right so as to maintain outward peace and unity through the vast empire. In the Greek city-state, with its small number of free citizens all directly participating in public affairs, it was possible to conceive an ideal of a common good which should bind all together. But in an Empire covering many languages, religions, local customs, varied and isolated occupations, a single system of administration and law exercised from a single central source could alone maintain the requisite harmony. The problems of legislations, codification, and administration were congenial to the Latin mind, and were forced by the actual circumstances. From the external side, then, as well as from the internal, the problem of control became dominant over that of value and the good.