There have been various philosophies dealing with the purposes of man. Man seeks this or that--the eternal good, beauty, happiness, pleasure, survival--but always he is represented as a seeker. A very popular doctrine, Hedonism, now somewhat in disfavor, represents him as seeking pleasurable, affective states. The difficulty of understanding the essential nature of pleasure and pain, the fact that what is pleasure to one man is pain to another, rather discredited this as a psychological explanation. I think we may phrase the situation fairly on an empirical basis when we say that seeking arises in instinct but receives its impulse to continuity by some agreeable affective state of satisfaction. Man steers towards pleasure and satisfaction of some type or other, but the force is the unbalance of an instinct. When we speak of man as a seeker, we are not separating him from the rest of living things. All life seeks, and the more mobile a living thing is the more it seeks. A sessile mussel chained to a rock seeks little but the fundamentals of nutrition and generation and these in a simple way. An animal that builds habitations for its young, courts its mate, plays, teaches and fights, may do nothing more than seek nutrition and generation, but it seeks these through many intermediary "end" points, through many impulses, and thus it has many types of satisfaction. When a creature develops to the point that it establishes all kinds of rules governing conduct, when it establishes sanctions that are eternal and has purposes that have a terminus in a hereafter which is out of the span of life of the planner, it becomes quite difficult to say just what it is man seeks. In fact, every man seeks many things, many satisfactions, and whatever it may be that Man in the abstract seeks, individual men differ very decidedly not only as to what they seek but as to what should be sought. Our viscera, our tissues, as they function, change by the using up of energy and the breaking down of materials. That change brings about sensory disturbances in our body which are not unpleasant in moderation, which we call hunger, thirst and fatigue. To relieve these three primitive states we seek food, drink and rest; we DESIRE food, drink and rest. Desire then is primitive, organic, arising mainly in the vegetative nervous system, and it awakens mechanisms that bring us food, drink and rest. A feeling which we call satisfaction results when the changes in the viscera and tissues are readjusted or on the way to readjustment. Here is the simplest paradigm for desire seeking satisfaction, but it is on a plane rarely found in man, because his life is too complicated for such formulae to work.