Epektasis, from Paul’s phrase about straining toward what lies ahead, is Gregory of Nyssa’s idea that because God is infinite, the soul’s ascent never ends. Every attainment becomes a new beginning, and perfection itself is perpetual growth. His Life of Moses sets out the teaching.
Epektasis
Endless progress: Gregory of Nyssa’s teaching that the soul stretches forward into God forever.
Also: perpetual progress