Thumos (also commonly spelled 'thymos'; θυμός) is the Ancient Greek concept of "spiritedness" (as in "a spirited stallion" or "spirited debate"). The word indicates a physical association with breath or blood and is also used to express the human desire for recognition. It is not a somatic feeling, as nausea and giddiness are. In Homer's works, thumos was used to denote emotions, desire, or an internal urge. Thumos was a permanent possession of living man, to which his thinking and feeling belonged. When a Homeric hero is under emotional stress, he may externalize his thumos and converse with or scold it. Achilles, in the Iliad, cares for his own honour; he keeps gods and deities in his heart; "...the thunderous lord of Hera might grant you the winning of glory, you must not set your mind on fighting the Trojans, whose delight is in battle, without me. So you will diminish my honour (thumos)." Democritus used "euthymia" (i.e. "good thumos") to refer to a condition in which the soul lives calmly and steadily, being disturbed by no fear, superstition, or other passions. For Democritus euthymia was one of the root aspects of the goal of human life. Plato's Phaedrus and his later work The Republic discuss thumos as one of the three constituent parts of the human psyche. In the Phaedrus, Plato depicts logos as a charioteer driving the two horses eros and thumos (erotic love and spiritedness are to be guided by logos). In the Republic (Book IV) soul becomes divided into (See Plato's tripartite theory of soul): nous ("intellect", "reason"), which is or should be the controlling part which subjugates the appetites with the help of thumos. thumos ("passion"), the emotional element in virtue of which we feel joy, amusement, etc. (the Republic IV, 439e); epithumia ("appetite", "affection"), to which are ascribed bodily desires; Plato suggested we have three parts of our soul, which in combination makes us better in our destined vocation, and is a hidden basis for developing our innate ideas.