Enlightenment is not an evolutionary attainment. On the contrary, ordinary existence is a temporary involution of our true nature.
Because nothing can cease to be what it is, this involution is not enduring. It arises at every instant, caused by wrong views and afflicted emotions, and is sustained momentarily by unwholesome conduct.
Enlightenment is not something to be attained in the future. Involution is to be reversed here and now.
In each moment, it is possible to revert to the natural state, Buddhahood.