But truly I am full {g} of power by the spirit of the LORD, and of judgment, and of might, to declare unto Jacob his transgression, and to Israel his sin.

(g) The Prophet being assured of his vocation by the Spirit of God, sets himself alone against all the wicked, showing how God gave him gifts, ability and knowledge, to discern between good and evil, and also steadfastness and endurance to reprove the sins of the people, and not to flatter them.

Wesley's Notes

3:8 Power - Courage, and vivacity. Of judgment - To discern times and seasons, right from wrong. Might - Resolution.

Jamieson-Fausset-Brown Bible Commentary

8. I-in contrast to the false prophets (Mic 3:5, 7).

full of power-that which "the Spirit of Jehovah" imparts for the discharge of the prophetical function (Lu 1:17; 24:49; Ac 1:8).

judgment-a sense of justice [Maurer]; as opposed to the false prophets' speaking to please men, not from a regard to truth. Or, "judgment" to discern between graver and lighter offenses, and to denounce punishments accordingly [Grotius].

might-moral intrepidity in speaking the truth at all costs (2Ti 1:7).

to declare unto Jacob his . sin-(Isa 58:1). Not to flatter the sinner as the false prophets do with promises of peace.

Matthew Henry's Concise Commentary

3:1-8 Men cannot expect to do ill, and fare well; but to find that done to them which they did to others. How seldom do wholesome truths reach the ears of those in high stations or in authority! Those who deceive others are preparing confusion for their own faces. The prophet had ardent love to God and to the souls of men; deep concern for his glory and their salvation, and zeal against sin. The difficulties he met with did not drive him from his work. He had this strength; not from and of himself, but he was full of power by the Spirit of the Lord. Those who act honestly, may act boldly. And those who come to hear the word of God, must be willing to be told of their faults, must take it kindly, and be thankful.