Answ. 1. The question de esse must go before the question de apparere. Either that which you say you are uncertain of is indeed a sin, or it is none. If it be no sin, then you are bound both to search till you know that it is no sin, and not to forbear your duty for it. But if really it be a sin, then your uncertainty of it is another sin; and that which God bindeth you to, is to forsake them both. 2. Your question containeth a contradiction: you cannot be certain that it is a duty at all to you, any further than you are certain whether the condition or means be lawful or a sin. What if an auditor in Spain or Italy say, I am certain that it is a duty to obey my teachers; but I am uncertain whether their doctrines of the mass, purgatory, and the rest, have any untruth or sin in them; therefore, I must not forbear certain obedience for uncertain sin. Or if a priest among them say, I am certain that it is a duty to preach God's word, but I am not certain that the Trent Articles, which I must swear or subscribe, are sinful or false; therefore I must not leave a great and certain duty for an uncertain sin. The answer to them both is easy. 1. It is your sin that you are uncertain of the sinfulness of those things, which God hath forbidden: and God biddeth you first to search the Scriptures, and cure that error. He made his law before your doubts arose, and will not change it because you doubt. 2. You contradict yourselves by a mistake. You have no more certainty that you should obey your teachers in these particulars, than you have that the things which they teach or command you are not against that law of God. You are certain that you must obey them in all things not forbidden by God, and within the reach of their office to require. And you are as certain that it is unlawful to obey them against the law of God, and that God must be obeyed before man. But whether you must obey them in this particular case, you cannot be certain, while you are uncertain whether it be forbidden of God. And the priest must be as uncertain whether it be any duty of his at all, to preach God's word, as he is uncertain of the lawfulness of the Trent oath or subscription, unless he can do it without. If a subject say, I am certain, that to govern the kingdom well is a great, good work and duty, but I am uncertain whether to depose the king if he govern not well, and set up myself, be a sin; therefore, the certain good must overrule the uncertain evil. I give him the same answer: 1. It is your sin to be uncertain whether rebellion be a sin; and God bindeth you to lay by the sin of your judgment, and not to make it a shoeing-horn to more. 2. You are sure that governing well is a good work; but you should be as sure, that it is no duty of yours, nor good work for you to do, as you are sure that you are but a private man and a subject, and never called to do the good of another's office. A private man may say, I am sure preaching is a good work; but I am not sure that a private, unordained man may not statedly separate himself to do it. But he can be no surer that it is a duty to him, than he is that he is called to it.
Quest. XII. Well, suppose my ignorance be my sin, and suppose that I am equally uncertain of the duty and of the sin annexed, yet if I have done all that I am able, and remain still unresolved, and after my most diligent inquiry am as much in doubt as ever, what should I then do?
Answ. 1. If you had by any former sin so forfeited God's assistance, as that he will leave you to your blindness, this altereth not his law and your obligations, which are still the same (to learn, understand, and practise). 2. But if you are truly willing to understand, and practise, and use his means, you have no cause to imagine that he will thus forsake you; undoubtedly he appointeth you no means in vain. If you attain not sufficient resolution to guide you in your duty, it is either because your hearts are false in the inquiry, and biassed, or unwilling to know the truth, or do it; or because you use not the true appointed means for resolution, but in partiality or laziness neglect it.
Quest. XIII. Suppose still my ignorance be my sin; which is the greater sin, to neglect the good work, or to venture on the feared evil that is annexed? I am not conscious of any unfaithfulness, but human frailty, that keepeth me from certainty. And no man is so perfect as to have no culpable ignorance, and to be certain in every point of duty. Therefore I must with greatest caution avoid the greatest sin, when I am out of hope of avoiding all. On one side, it is a common rule that I must do nothing against conscience, (no, not a doubting conscience,) though I must not always do what it biddeth me. "For he that doubteth is condemned if he eat: for whatsoever is not of faith is sin," Rom. xiv. 23. On the other side, if all duty be omitted which conscience doubteth of, I may be kept from almost every duty.
Answ. The heart is so deceitful that you have great cause to watch, lest human frailty be pretended, for that error, which a corrupted, biassed, partial mind, or wilful laziness, is the cause of. Diligent study, and inquiry, and prayer, with a sincere desire to know the truth, may succeed, at least, to so much satisfaction, as may keep your minds in quietness and peace, and give you comfort in your way, and preserve you from all such sin as is inconsistent with this your safety and acceptance with God. But yet it is true that human frailty will occasion in the best uncertainties in some particular cases; and though God make it not our duty of two sins to choose the less, but to refuse both, yet he maketh it our duty more diligently to avoid the greater than the less. And ofttimes the case is so sudden that no inquiry can be made: and therefore I confess a christian should know which sins are greatest and to be most avoided. At present I shall lay down these following rules, premising this, that where accidents and circumstances which make sins great or small are to be compared, they are ofttimes so numerous and various, that no rules can be laid down beforehand, that will serve all turns, no more than in law and physic, any law books or physic books will serve all cases without a present experienced judicious counsellor: present prudence and sincerity must do most.
Rule I. In things altogether indifferent, nothing must be done that conscience doubteth of, because there is a possibility or fear of sinning on the one side, but none on the other; and in that case it is a certain sin to venture on a feared sin. But then it is supposed that the thing be indifferent as clothed with all its circumstances, and that there be no accident that taketh away its indifferency.
Rule II. In case the thing be really unlawful, and I think it to be lawful, but with some doubting, but am clear that the forbearing it is no sin; there the sin is only in the doing it; because all is clear and safe on the other side.
Rule III. There are many sins which are always and to all persons in all cases sins, and not doubted of by any without gross unfaithfulness or negligence; and here there is no room for any doubting whether we must do that good which cannot be done without that sin, it being certain that no such good can be a duty. As, to commit idolatry, to blaspheme God, to deny Christ, to deny the Scriptures, to hate, or reproach, or oppose a holy life, to be perjured, to approve or justify the sin of others, &c. It can be no duty which cannot be done without the wilful yielding to or committing these or any known sin.
Rule IV. There are some duties so great, and clear, and constant to all, that none but a profligate or graceless conscience (or one that is fearfully poisoned with sin) can make a doubt of it deliberately: these therefore come not within the case before us.
Rule V. If moral evil be compared only with natural good, or moral good with natural evil, there is no doubt to be made of the case: the least sin having more evil in it than the prosperity or lives of millions of men have good (considered in themselves as natural good); and the least duty to God having more good in it than the death of millions of men (as such) hath evil. For the good of duty and the evil of sin are greatened by their respect to God, and the other lessened as being good or evil only unto men, and with respect to them.