Animus et mens represents one of the fundamental distinctions in Latin psychological vocabulary. Animus is the vital, passionate, emotional dimension of the inner life — the part that loves, rages, grieves, and desires — while mens is the rational, reflective, deliberating faculty of the mind. The distinction maps roughly onto the later Freudian contrast between id (animus) and ego/superego (mens), and onto the Platonic tripartite soul's distinction between the spirited part (thumos) and the rational part (logos). Students should note that
Horace's ideal of the balanced poem — dulce et utile, pleasing and useful — requires the cooperation of animus and mens: without animus, the poem is cold and merely clever; without mens, it is incoherent and merely emotional. The creative tension between
these two faculties is one of the most productive subjects in
poetics.