information:classification
Classical world

In Western civilisation, the basic meanings of κακός and ἀγαθός are "bad, cowardly" and "good, brave, capable", and their absolute sense emerges only around 400 BC, with pre-Socratic philosophy, in particular Democritus. Morality in this absolute sense solidifies in the dialogues of Plato, together with the emergence of monotheistic thought (notably in Euthyphro, which ponders the concept of piety (τὸ ὅσιον) as a moral absolute). The idea was further developed in Late Antiquity by Neoplatonists, Gnostics, and Church Fathers.

This development from the relative or habitual to the absolute is also evident in the terms ethics and morality both being derived from terms for "regional custom", Greek ήθος and Latin mores, respectively (see also siðr).