Procession & Return

Proclus gave the Neoplatonist universe its governing rhythm in a triad: remaining (mone), procession (proodos), and return (epistrophe). Every effect remains in its cause even as it proceeds out into its own distinct existence, and then turns back toward that cause in desire and contemplation. This triple movement is not a sequence in time but a permanent structure, and it repeats at every level of reality, from the One down to the lowest beings.

What it explains

The pattern accounts for both the unity and the dynamism of the cosmos. Procession is the emanation of the many from the one; remaining preserves the dependence of effect on cause, so that nothing is ever cut off from its source; and return is the answering longing that draws all things back — the same impulse at work in the soul's ascent and in love. Because the effect both differs from and resembles its cause, it can turn back toward it.

Formalized in the Elements of Theology, this rhythm let Proclus deduce the whole structure of reality with near-geometric rigor, and through him it passed into Christian and Islamic metaphysics, where the going-out and return of creation became a central theme.