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.