 Anselm said this, because we have sinned against the God who made us, to whom we owe everything, our whole existence, we incur a debt to God. And it's something like infinity plus one. Why? Because God gave us everything. And even then, even after he gave us everything, we still turned away from him. Our first parents did in the Garden of Eden. You better believe that we would have done it even quicker had you and I been there.