Appetite occupies a foundational position in the depth-psychological and philosophical corpus as the primal motor of non-rational desire—the faculty that moves the soul toward pleasure without the mediation of deliberative reason. The tradition running from Plato through Aristotle to the Christian commentators establishes appetite (epithumia, orexis) as the lowest yet most tenacious member of a tripartite or bipartite soul, capable of conflict with both reason and spirit. Plato's Republic founds the argument for tripartition on appetite's non-rational constitution: because appetite can desire what reason condemns, the soul must be composite. Aristotle refines this by locating appetite within a broader theory of orexis and phantasia, showing how appetitive desire arises through sensory impression rather than practical thought, and how—unlike spirit—it cannot be fundamentally reformed by reason's evaluative outlook, only modulated by habituation. John of Damascus inherits this structure theologically, distinguishing the free rational appetite of humans from the blind natural appetite of beasts. Marion Woodman transposes the framework into clinical depth psychology, reading obesity and anorexia as disorders of appetite whose roots reach into unconscious psychic conflict. The key tensions across the corpus are: whether appetite is purely pleasureseeking or can be directed toward the apparent good; whether habituation can genuinely transform it or merely contain it; and whether its energy, when repressed, produces symptomatic displacement in the body. Appetite thus stands at the crossroads of ethics, psychology, and embodiment.
mind is never found producing movement without appetite (for wish is a form of appetite; and when movement is produced according to calculation it is also according to wish), but appetite can originate movement contrary to calculation
Aristotle establishes appetite as the indispensable motive force in all animal movement, capable of acting contrary to rational calculation and thus irreducible to reason.
, On the Soul (De Anima), -350thesis
In the virtuous person, appetite and spirit have come to be in perfect harmony with reason (1102b 28). The virtuous person's appetitive desires are as they are not because reason has managed to persuade the non-rational part
Lorenz argues that Aristotelian virtue does not consist in reason persuading appetite but in the person learning to take pleasure in the right things through habituation, leaving appetite's non-rational character intact.
, The Brute Within: Appetitive Desire in Plato and Aristotle, 2006thesis
Plato's theory of the tripartite soul is coherent only if he conceives of appetite as non-rational. Chapter 1 is introductory. It lays out in some detail what the rest of Part 1 is meant to establish
Lorenz argues that the entire Platonic argument for tripartition depends on appetite being non-rational, since a rational appetite would generate internal conflicts that undermine the soul-partition principle.
, The Brute Within: Appetitive Desire in Plato and Aristotle, 2006thesis
there is no way at all in which appetite's general evaluative outlook derives from, and perhaps is sustained by, correct reason
Lorenz distinguishes appetite from spirit by showing that appetite, unlike spirit, cannot derive its evaluative orientation from reason even over time, making it the most thoroughly non-rational part of the soul.
, The Brute Within: Appetitive Desire in Plato and Aristotle, 2006thesis
we learn with one part of our nature, are angry with another, and with a third part desire the satisfaction of our natural appetites; or whether the whole soul comes into play in each sort of action—to determine that is the difficulty
Plato's Socrates poses the foundational question of soul-partition by asking whether appetite, reason, and spirit are distinct sources of motivation or expressions of a single unified soul.
, Republic, -380thesis
the appetite of creatures without reason is irrational, and they are ruled by their natural appetite. Hence, neither the names of will or wish are applicable to the appetite of creatures without reason.
John of Damascus distinguishes animal appetite as purely natural and irrational from human rational appetite governed by will and freedom, embedding the classical tripartite scheme in Christian anthropology.
, Saint John of Damascus Collection, 2016thesis
desire comprises appetitive desire, spirited desire, and wish. And all animals have at least one of the senses, touch. For that which has perception, there is both pleasure and pain, and both the pleasant and the painful; and where there are these, there also is appetitive desire
Aristotle grounds appetitive desire in the most basic capacity for pleasure and pain, linking it inseparably to perception and establishing it as the minimal form of desire present in all sentient creatures.
, The Brute Within: Appetitive Desire in Plato and Aristotle, 2006supporting
the argument is meant to demonstrate that the human soul consists of three parts—reason, spirit, and appetite. While Socrates does seem to allow that further parts may come to light
Lorenz reconstructs Plato's tripartition argument, showing that appetite's capacity to conflict with both reason and spirit requires it to be a distinct, bounded part of the soul.
, The Brute Within: Appetitive Desire in Plato and Aristotle, 2006supporting
in a parallel passage Plato contrasts appetite (epithumia), as being directed at pleasure, with boulēsis, which is directed at good.
Sorabji traces Plato's distinction between appetite directed toward pleasure and rational wish directed toward the good, establishing a persistent tension in ancient psychology between pleasure-seeking and good-seeking desire.
, Emotion and Peace of Mind: From Stoic Agitation to Christian Temptation, 2000supporting
appetite is in no position to grasp the fact that going to the shop is a means to satisfying its desire to smoke. So it is hard to see how appetite could respond to the situation by forming a desire specifically to go to the shop around the corner.
Lorenz demonstrates that, on Plato's theory, appetite lacks the cognitive capacity for means-end reasoning, and can only respond to representations that present pleasure directly.
, The Brute Within: Appetitive Desire in Plato and Aristotle, 2006supporting
to act as the incontinent man does, in accordance with appetite against reason, is unjust. But injustice is voluntary. Therefore to act as the incontinent man does, in accordance with appetite against reason, is voluntary.
Adkins exposes the paradox in Aristotle's account of akrasia: acting in accordance with appetite against reason is simultaneously voluntary and involuntary, a contradiction that Aristotle is forced to confront.
, Merit and Responsibility: A Study in Greek Values, 1960supporting
Socrates neither claims nor implies that appetite can reason or use reason. He admittedly leaves it somewhat unclear how it is that appetite, which is not itself equipped with the capacity for reasoning, comes to be attached to money.
Lorenz shows that Plato consistently maintains appetite's non-rational character even when it is directed toward complex social objects like money, which it values as an immediate source of pleasure rather than instrumentally.
, The Brute Within: Appetitive Desire in Plato and Aristotle, 2006supporting
mania is contrasted with sophrosune, the state of soul in which intellect rules securely over the other elements. It is linked particularly with the dominance of erotic appetite.
Nussbaum connects Platonic madness to the dominance of erotic appetite over intellect, framing appetite's excess as the psychic condition underlying both poetic inspiration and moral disorder.
, The Fragility of Goodness: Luck and Ethics in Greek Tragedy and Philosophy, 1986supporting
The hypothalamus, an area of the brain just above and connected to the pituitary gland, coordinates the action of all the hormones in the body, including those which control appetite and the menstrual cycle.
Woodman grounds appetite in neurobiological and hormonal regulation, situating the depth-psychological analysis of eating disorders within the somatic reality of hypothalamic control.
, The Owl Was a Baker's Daughter: Obesity, Anorexia Nervosa and the Repressed Feminine: a Psychological Study, 1980supporting
Christian substance abusers and addicts have a worship problem (called idolatry) in that they seek to fulfill temporary appetites with temporary pleasures rather than disciplining themselves for godliness
Shaw reframes addiction as a theological misdirection of appetite, arguing that natural appetites become disordered when they are devoted to temporal objects rather than oriented toward the divine.
, The Heart of Addiction: A Biblical Perspective, 2008supporting
some instances of appetite and anger involve pleasure, some distress, and some both. So one cannot classify anger or appetite as a whole as falling under one of his two genera
Sorabji reports Aspasius' recognition that appetite resists simple classification as either pleasure or distress, pointing toward the need for a third genus—desire itself—under which it properly falls.
, Emotion and Peace of Mind: From Stoic Agitation to Christian Temptation, 2000supporting
phantasia [sc. suitably prepares] desire; and phantasia arises through thought (noēsis) or through perception
Lorenz cites Aristotle's 'chain of movers' passage to show that phantasia is the proximate cognitive condition for the formation of appetitive desire, mediating between perception and motivated movement.
, The Brute Within: Appetitive Desire in Plato and Aristotle, 2006supporting
the vital or appetitive faculties are will and choice. Now, to make what has been said clearer, let us consider these things more closely
John of Damascus classifies will and choice as the soul's appetitive faculties, distinguishing them from the cognitive faculties and placing appetite at the center of the soul's active, volitional life.
, An Exact Exposition of the Orthodox Faith, 2021aside
it is specifically from these distinct items, rather than from the soul as a whole, that human motivation, in its various forms, arises
Lorenz argues that Platonic tripartition is not merely a typology of motivations but an ontological claim about the soul's composite structure, with distinct parts as the proper subjects of desire.
, The Brute Within: Appetitive Desire in Plato and Aristotle, 2006aside