SPROUL: In the first place, we’re talking about what we ought to do as distinguished from what we actually do. God commands us to seek after Him. God commands us to be perfect. God commands us to be obedient in all things. The assumption is that if God commands you to do something, you must have the ability to do it. This is what created the biggest theological issue in the first four centuries of Christendom—the debate between Pelagius and Augustine over the question of whether we, as fallen human beings, have the moral ability to lead perfect lives.