*Minor differences ignored. Grouped by changes, with first version listed as example.
My mouth shall speak truth - Truth, without falsity, or any mixture of error, shall be the whole matter of my discourse.
For my mouth shall speak truth,.... And nothing but the truth; and nothing more or less can be spoken by Wisdom, or Christ, who is truth itself; nothing else can come out of his mouth, or drop from his lips; all the doctrines of Christ are agreeable to the Scriptures of truth, and are what the Spirit of truth leads into; and the whole is called "the word of truth": there are many very particular and special truths, but the principal one is salvation by Jesus Christ;
and wickedness is an abomination to my lips; the sin of lying more especially, as opposed to truth; this is detestable to wisdom, what Christ never suffered his lips to utter; for no lie is of the truth, but of Satan the father of lies; and, as it is abhorred by Christ, it ought to be by all good men.
For . . . truth--literally, "My palate shall meditate," or (as Orientals did) "mutter," my thoughts expressed only to myself are truth.
wickedness--specially falsehood, as opposed to truth.
כּי continues the reason (begun in Proverbs 8:6) for the Hearken! (cf. Proverbs 1:15-17; Proverbs 4:16.); so that this second reason is co-ordinated with the first (Fl.). Regarding אמת, vid., at Proverbs 3:3; הגה, here of the palate (cf. Psalm 37:30), as in Proverbs 15:28 of the heart, has not hitherto occurred. It signifies quiet inward meditation, as well as also (but only poetically) discourses going forth from it (vid., at Psalm 1:2). The contrary of truth, i.e., moral truth, is רשׁע, wickedness in words and principles - a segolate, which retains its Segol also in pausa, with the single exception of Ecclesiastes 3:16.
*More commentary available at chapter level.