In Knowing Scripture, R.C. Sproul wrote: “What if, after careful consideration of a biblical mandate, we remain uncertain as to its character as a principle or custom . . . Would it be better to treat a possible custom as a principle and be guilty of being over-scrupulous in our design to obey God? Or would it be better to treat a possible principle as a custom and be guilty of being unscrupulous in denoting a transcendent requirement of God to the level of a mere human convention? I hope the answer is obvious” (p. 111).