The Gods got bored. And the God of Insanity dared his brothers and sisters (God of Death, Life, Love and Mind) to choose one Mortal to live with for the rest of their lifetime. Basically choose a companion and see how long you (as a God) can live with them!
Unfortunately for the God of Minds (Neo) he did not know many Mortals, while the other four did. So he needed to find a Mortal. And he chose you, the first Mortal he found.
.p.