Natural energy again is the force in each essence by which its nature is made manifest. And again: natural energy is the primal, eternally-moving force of the intelligent soul: that is, the eternally-moving word of the soul, which ever springs naturally from it. And yet again: natural energy Cf. Anast. Sin. in ῾Οδηγός, p. 43; John of Dam., Dialect. c. 30; Greg. Nyss., in Maximus, II., p. 155. is the force and activity of each essence which only that which is not lacks.