…That we may then really glory that we are the children of God, he bids us to act calmly and meekly towards our brethren; otherwise he declares that we are lying in assuming the Christian name.
13 Who is a wise man. As the lust of slandering arises mostly from pride, and as the false conceit of wisdom for the most part generates pride, he therefore speaks here of wisdom. It is usual with hypocrites to exalt and shew off themselves by criminating all others, as the case was formerly with many of the philosophers, who sought glory for themselves by a bitter abuse of all other orders. Such haughtiness as slanderous men swell with and are blinded by, James checked, by denying that the conceit of wisdom, with which men flatter themselves, has in it anything divine; but, on the contrary, he declares that it proceeds from the devil.
Then the meaning is, that supercilious censors, who largely indulge themselves, and at the same time spare none, seem to themselves to be very wise, but are greatly mistaken; for the Lord teaches his people far otherwise, even to be meek, and to be courteous to others. They, then, are alone wise in the sight of God, who connect this meekness with an honest conversation; for they who are severe and inexorable, though they may excel others in many virtues, do not yet follow the right way of wisdom.
l4 But if ye have bitter envying. He points out the fruits which proceed from that extreme austerity which is contrary to meekness; for immoderate rigor necessarily begets mischievous emulations, which presently break forth into contentions. It is, indeed, an improper mode of speaking, to place contentions in the heart; but this affects not the meaning; for the object was to shew that the evil disposition of the heart is the fountain of these evils.
He has called envying, or emulation, bitter; for it prevails not, except when minds are so infected with the poison of malignity, that they turn all things into bitterness.
That we may then really glory that we are the children of God, he bids us to act calmly and meekly towards our brethren; otherwise he declares that we are lying in assuming the Christian name. But it is not without reason that he has added the associate of envying, even strife, or contention, for contests and quarrels ever arise from malignity and envy.
15 This wisdom descendeth not. As hypocrites with difficulty give way, he sharply checked their haughtiness, denying that to be true wisdom with which they were inflated, while they were extremely morose in searching out the vices of others. Conceding to them, however, the term wisdom, he shews by the words he applies to it its true character, and says that it is earthly, sensual, devilish, or demoniac, while true wisdom must be heavenly, spiritual, divine; which three things are directly contrary to the three preceding ones. For James takes it as granted, that we are not wise, except when we are illuminated by God from above through his Spirit. However, then, the mind of man may enlarge itself, all its acuteness will be vanity; and not only so, but being at length entangled in the wiles of Satan, it will become wholly delirious.
16 For where envying is. It is an argument from what is contrary; for envying, by which hypocrites are influenced, produces effects contrary to wisdom. For wisdom requires a state of mind that is calm and composed, but envying disturbs it, so that in itself it becomes in a manner tumultuous, and boils up immoderately against others.
17 But the wisdom which is from above. He now mentions the effects of celestial wisdom which are wholly contrary to the former effects. He says first that it is pure; by which term he excludes hypocrisy and ambition. He, in the second place, calls it peaceable, to intimate that it is not contentious. In the third place, he calls it kind or humane, that we may know that it is far away from that immoderate austerity which tolerates nothing in our brethren. He also calls it gentle or tractable; by which he means that it widely differs from pride and malignity. In the last place, he says that it is full of mercy, etc., while hypocrisy is inhuman and inexorable. By good fruits he generally refers to all those duties which benevolent men perform towards their brethren; as though he had said, it is full of benevolence. It hence follows, that they lie who glory in their cruel austerity.
…But what he says, without discerning (sine dijudicatione,) seems strange; for the Spirit of God does not take away the difference between good and evil; nor does he render us so senseless as to be so void of judgment as to praise vice, and regard it as virtue. To this I reply, that James here, by discerning or distinguishing refers to that overanxious and overscrupulous inquiry, such as is commonly carried on by hypocrites, who too minutely examine the sayings and doings of their brethren, and put on them the worst construction.
18 And the fruit of righteousness. This admits of two meanings, — that fruit is sown by the peaceable, which afterwards they gather, — or, that they themselves, though they meekly tolerate many things in their neighbors, do not yet cease to sow righteousness. It is, however, an anticipation of an objection; for they who are carried away to evil speaking by the lust of slandering, have always this excuse, “What! can we then remove evil by our courteousness?” Hence James says, that those who are wise according to God’s will, are so kind, meek, and merciful, as yet not to cover vices nor favor them; but on the contrary in such a way as to strive to correct them, and yet in a peaceable manner, that is, in moderation, so that union is preserved. And thus he testifies that what he had hitherto said tends in no degree to do away with calm reproofs; but that those who wish to be physicians to heal vices ought not to be executioners.
He therefore adds, by those who make peace; which ought to be thus explained: they who study peace, are nevertheless careful to sow righteousness; nor are they slothful or negligent in promoting and encouraging good works; but they moderate their zeal with the condiment of peace, while hypocrites throw all things into confusion by a blind and furious violence.
Taken from Calvin’s commentary on James, found online here.