The Good (Agathon / Bonum) — A central concept of ethics and metaphysics that designates, broadly, that toward which all things tend and, in the moral sense, the ultimate criterion of what one ought to do. The Greek term to agathon originally expressed both what is “good for” some end (the useful, the advantageous) and what is excellent in itself. For Plato, especially in the Republic, the Good is the supreme Idea, the source of the being and intelligibility of all other Forms: in the so-called Analogy of the Sun (Book VI), it is compared to the sun that makes things visible and gives life, and the ascent toward the Good is dramatized in the Allegory of the Cave (Book VII). Aristotle, in the Nicomachean Ethics, rejects a single separate Good and redefines it in functional terms: the good of each thing is that toward which it tends by nature, its end or telos; the human good is eudaimonia, the flourishing life lived in accordance with virtue and reason. In medieval ethics, Augustine and Thomas Aquinas identify the Supreme Good (summum bonum) with God, the final end to which all things are ordered. Modernity shifts the axis: in the Groundwork of the Metaphysics of Morals, Kant rejects any “material” good as the foundation of morality and admits only the good will as an unconditional good, valuable in itself. The Good is thus bound up with neighboring notions such as telos (end), virtue, and eudaimonia, standing opposed to evil understood as its privation or absence.
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