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.

"Apparently there are hobbyists who try to build nuclear weapons—all they need is the plutonium."

"I was given to understand plutonium is hard to get."

"Yes, there are good reasons for this."

"What, the anthropic principle?"