14. if ye have—as is the case (this is implied in the Greek indicative).
bitter—Eph 4:31, "bitterness."
envying—rather, "emulation," or literally, "zeal": kindly, generous emulation, or zeal, is not condemned, but that which is "bitter" [Bengel].
strife—rather, "rivalry."
in your hearts—from which flow your words and deeds, as from a fountain.
glory not, and lie not against the truth—To boast of your wisdom is virtually a lying against the truth (the gospel), while your lives belie your glorying. Jas 3:15; Jas 1:18, "The word of truth." Ro 2:17, 23, speaks similarly of the same contentious Jewish Christians.