6. But because you will object, that, alas, few even of the upright, have wits so strong as to be fit for this, I add, that he that will walk uprightly, must in the great essential parts of religion have this foresaid knowledge of his own, and in the rest at least he must have the conduct of the wise. And therefore, 1. He must be wise in the great matters of his salvation, though he be weak in other things. 2. And he must labour to be truly acquainted who are indeed wise men, that are meet to be his guides: and he must have recourse to such in cases of conscience, as a sick man to his physician. It is a great mercy to be so far wise, as to know a wise man from a fool, and a counsellor from a deceiver.[7]
7. He that will walk uprightly must be the master of his passion; not stupid, but calm and sober. Though some passion is needful to excite the understanding to its duty, yet that which is inordinate doth powerfully deceive the mind. Men are very apt to be confident of what they passionately apprehend; and passionate judgments are frequently mistaken, and ever to be suspected; it being exceeding difficult to entertain any passion which shall not in some measure pervert our reason; which is one great reason why the most confident are ordinarily the most erroneous and blind. Be sure therefore whenever you are injured, or passion any way engaged, to set a double guard upon your judgments.[8]
8. He that will walk uprightly, must not only difference between simple good and evil, but between a greater good and a less; for most sin in the world consisteth in preferring a lesser good before a greater. He must still keep the balance in his hand, and compare good with good; otherwise he will make himself a religion of sin, and prefer sacrifice before mercy; and will hinder the gospel and men's salvation for a ceremony, and violate the bonds of love and faithfulness for every opinion which he calleth truth; and will tithe mint and cummin, while he neglecteth the great things of the law. When a lesser good is preferred before a greater, it is a sin, and the common way of sinning. It is not then a duty when it is inconsistent with a greater good.[9]
9. He must ever have a conjunct respect to the command and the end: the good of some actions is but little discernible any where, but in the command; and others are evidently good because of the good they tend to. We must neither do evil and break a law, that good may come by it; nor yet pretend obedience to do mischief, as if God had made his laws for destruction of the church or men's souls, and not for edification.[10]