neuroplastic hemispheric network regeneration
Catalyst, free will, agency of the soul.
The cycle of energy (Karma) plays a large part. From the tangibly perceivable to the speculatively metaphysical.
To add, ying & yang (bipolar duality - known in qualities like chaos/order, creation/destruction, masculine/feminine) scales micro to macro. If all is one, there are innumerable layers of these dualities all simultaneously interacting, independent of time and space, to find balance among themselves. I'm partial to the notion that God is 'love'.