How do we know that our purpose is not to be bad? Surely evil men have, by extension, caused some good. And even without that idea, we have no use what our purpose is on this earth -- how do we know that us being bad isn't part of the divine plan?
Or, put another way, how can it be both that God wants us to follow His will, and also evil/bad people be part of the divine plan?
Are there any sources that discuss this idea?