Ayn Rand said that a Spanish proverb said that God said, "Take what you want, and pay for it."
But instructions from God would be redundant. Matter does not obey physical law out of fear of punishment or a sense of moral duty; what we call a "law" is a characterization of that which exists. So too with this.
Some people find it easier to do logical inference on the demands of an imagined agent then the tendency of things to be a certain way.