Zero Factorial.

Once upon a time there was no time but self not wanting to be by itself. And so self moved itself out of love; so to love and be loved in return. As such abiogenesis otherwise known as the origin of the universe, earth and life. As to the theory of evolution? Self (teo) is love (evol) in action (ution). Without action (entropy) there would be no way for self to experience love. Love naturally being a synonym for companionship and friendship. But in most simple terms.
The purpose of self is love.
~ Wald Wassermann