Matthew Poole and continuators on James 3:14

14 But if ye have bitter envying , and strife in your hearts , glory not , and lie not against the truth .

Gr. Zeal, which he calls bitter, partly to distinguish it from that Zeal which is good; whereas this he speaks of is evil; and though it pretends to be Zeal, yet is really no other than Envy; and partly because it commonly proceeds from an imbittered Spirit, and tends to the imbittering it more.

Strife, the usual Effect of bitter Zeal, or Envy.

The Fountain whence it proceeds; or Strife in the Heart implies a Heart propense, and inclined to Strife.

Glory not of your Zeal, or rather, of your Wisdom, as if you were so well able to reprehend others, but rather be humbled; what you make the matter of your glorying, being really just cause of Shame.

Viz. By professing your selves wife, or zealous, when ye are really neither.

Marginal references: Rom. 13.13.