James 3:13

Hyperichius said, 'He who teaches others by his life and not his speech is truly wise.'

Who among you is wise and disciplined, let him show by good conduct his works in the humility of wisdom. Because he had imposed silence on wicked teachers and had forbidden them to hold the rank of teacher, since he saw that they had neither the perfection of life nor the restraint of the tongue, he consequently admonishes that if anyone among them is wise and disciplined, or appears to be so to himself, let him show his wisdom and discipline more by living wisely and disciplined than by teaching others. For he who with meek heart and calm speech does the good which he can, surely gives evident proof of a wise man. For the beginning of wisdom is the fear of the Lord (Psalm 110). But he who is more inclined to preach the word than to act often incurs the guilt of foolishness through the love of boasting, through the zeal of contention, through the facility of eloquence, through the envy of other teachers, through ignorance of the catholic truth. Well does that saying of Solomon apply to him: For in the multitude of words there wanteth not sin (Proverbs 14). Hence it is rightly added here:

Who is wise and has knowledge among you? Let him show by good conversation his working in mildness of wisdom. But if you have bitter zeal, and there be disputes in your hearts: glory not and be not liars against the truth. For this is not wisdom descending from above: but earthly, sensual, devilish. For where zeal and contention is: there is inconstancy, and every perverse work. "Who is wise and has knowledge among you?" When men were ambitious and boasted of the wisdom of this world, they preached from disagreement and rivalry of the rulers, openly inciting the people to agitation, and besides, they were wasting away with envy and allowing human things to mingle with divine, so that the examiners were drawn in by the novelty of what was being said; hence also heresies arose. Therefore, after completing the discourse on the slander and intemperance of the tongue, he then transitions to envy, which arises in men from similar recklessness: and he says that these doctrines are not established and firm, as they are not from divine wisdom, but rather demonic. However, he said this to encourage the good teacher, saying that he should show his wisdom through good works with his gentleness. Moreover, since the name of zeal, that is passion, is neutral and indifferent in itself to good and evil. (For zeal, or passion, is a movement of the heart stirred up towards something with some similarity to that which is the object of study or affection) therefore he added bitter zeal, showing what passion leads to. Indeed, contentiousness is a blameworthy contention and obstinacy.