To make Covenant with God, is impossible, but by Mediation of such as God speaketh to, either by Revelation supernaturall, or by his Lieutenants that govern under him, and in his Name; For otherwise we know not whether our Covenants be accepted, or not. And therefore they that Vow any thing contrary to any law of Nature, Vow in vain; as being a thing unjust to pay such Vow. And if it be a thing commanded by the Law of Nature, it is not the Vow, but the Law that binds them.