Freedom from pain is thus made the primary element of happiness; a one-sided view, respected in the doctrine of Locke, that it is not the idea of future good, but the present greatest uneasiness that most strongly affects the will. A neutral state of feeling is necessarily imperilled by a greedy pursuit of pleasures; hence the _dictum_, to be content with little is a great good; because little is most easily obtained. The regulation of the desires is therefore of high moment. According to Epicurus, desires fall into three grades. Some are _natural_ and _necessary_, such as desire of drink, food, or life, and are easily gratified. But when the uneasiness of a want is removed, the bodily pleasures admit of no farther increase; anything additional only _varies_ the pleasure. Hence the luxuries which go beyond the relief of our wants are thoroughly superfluous; and the desires arising from them (forming the _second_ grade) though _natural, are not necessary_. A _third_ class of desires is neither natural nor necessary, but begotten of vain opinion; such as the thirst for civic honours, or for power over others; those desires are the most difficult to gratify, and even if gratified, entail upon us trouble, anxiety, and peril. [This account of the desires, following up the advice--If you wish to be rich, study not to increase your goods, but to diminish your desires--is to a certain extent wise and even indispensable; yet not adapted to all temperaments. To those that enjoy pleasure very highly, and are not sensitive in an equal degree to pain, such a negative conception of happiness would be imperfect.] Epicurus did not, however, deprecate positive pleasure. If it could be reached without pain, and did not result in pain, it was a pure good; and, even if it could not be had without pain, the question was still open, whether it might not be well worth the price. But in estimating the worth of pleasure, the absence of any accompanying pain should weigh heavily in the balance. At this point, the Epicurean theory connects itself most intimately with the conditions of virtue; for virtue is more concerned with averting mischief and suffering, than with multiplying positive enjoyments. Bodily feeling, in the Epicurean psychology, is prior in order of time to the mental element; the former was primordial, while the latter was derivative from it by repeated processes of memory and association. But though such was the order of sequence and generation, yet when we compare the two as constituents of happiness to the formed man, the mental element much outweighed the bodily, both as pain and as pleasure. Bodily pain or pleasure exists only in the present; when not felt, it is nothing. But mental feelings involve memory and hope--embrace the past as well as the future--endure for a long time, and may be recalled or put out of sight, to a great degree, at our discretion.