Wu-wei is a Taoist term used in The Way of Pathei-Mathos/The Numinous Way to refer to a personal ‘letting-be’ deriving from a feeling, a knowing, that an essential part of wisdom is cultivation of an interior personal balance and which cultivation requires acceptance that one must work with, or employ, things according to their nature, their φύσις, for to do otherwise is incorrect, and inclines us toward, or is, being excessive – that is, toward the error, the unbalance, that is hubris, an error often manifest in personal arrogance, excessive personal pride, and insolence – that is, a disrespect for the numinous.
In practice, the knowledge, the understanding, the intuition, the insight that is wu-wei is a knowledge, an understanding, that can be acquired from empathy, πάθει μάθος, and by a knowing of and an appreciation of the numinous. This knowledge and understanding is of wholeness, and that life, things/beings, change, flow, exist, in certain natural ways which we human beings cannot change however hard we might try; that such a hardness of human trying, a belief in such hardness, is unwise, un-natural, upsets the natural balance and can cause misfortune/suffering for us and/or for others, now or in the future. Thus success lies in discovering the inner nature (the physis) of things/beings/ourselves and gently, naturally, slowly, working with this inner nature, not striving against it.
Source – Synopsis of The Numinous Way