_Answ._ This is a promise of omitting that which else would be a duty. It is ordinarily a duty to reveal a thief and bribe-taker that he may be punished. But affirmatives bind not _ad semper_; no act (especially external) is a duty at all times, therefore not this, of revealing an offender's fault. And if it be not always a duty, then it must be none when it is inconsistent with some greater benefit or duty; for when two goods come together, the greater is to be preferred: therefore in case that you see in just probability, that the concealment of the sinner will do more hurt to the commonwealth or the souls of men, than the saving of your life is like to do good, you may not promise to conceal him, or if you sinfully promise it, you may not perform it; but in case that your life is like to be a greater good than the not promising to conceal him, then such a promise is no fault, because the disclosing him is no duty. But to judge rightly of this is a matter of great difficulty. If it be less than life which you save by such a promise, it oft falls out that it is a lesser good than the detecting of the offence. But it will here be said, If I promise not to conceal a robber, I must conceal him nevertheless; for when he hath killed me, I cannot reveal him: and I must conceal the bribe-taker; for till I have promised secrecy, I cannot prove him guilty. And he that promiseth to forbear a particular good action whilst he liveth, doth yet reserve his life for all other good works; whereas if he die, he will neither do that nor any other. But this case is not so easily determined: if Daniel die, he can neither pray nor do any good on earth. And if he live he may do much other good, though he never pray; and yet he might not promise to give over praying to save his life. I conceive that we must distinguish of duties essential to the outward part of christianity, or of constant, indispensable necessity; and duties which are alterable, and belong only to some persons, times, and places; also between the various consequents of omissions. And I conceive that ordinarily a man may promise for the saving of his life, that he will forbear a particular, alterable duty or relation; as to read such a commentary, to speak with such a minister, to be a magistrate or a minister, &c. in case we have not before bound ourselves never to give over our calling till death; and in case that the good which will follow our forbearance, is likely (to a judicious person) to be greater than the evil. But no man may promise to omit such a duty as God hath made necessary during life; as not to love God, or fear, or trust him; not to worship him, and call upon him, and praise him; not to do good to men's souls or bodies in the general; or not to preach or pray while I am a minister of Christ; or not at all to govern while you are a governor; for all these contradict some former and greater promises or duties. Nor may you omit the smallest duty to save your