Well, maybe the guy above me have already answered it, but in my view, Godwoken is basically a chosen one by a respective god. The Gods apparently are just source-hungry tyrannical beings and want you (or whoever they choose) to gather as much source as possible to sustain themselves, since they have been weakened. They can also provide you with some types of blessings with the remaining power they have so you achieve what they want. Maybe I am completely wrong but that´s what I took from it...
