Albert Barnes Commentary Micah 3:8

"But as for me, I am full of power by the Spirit of Jehovah, and of judgment, and of might, to declare unto Jacob his transgression, and to Israel his sin." — Micah 3:8 (ASV)

And truly I - (Literally, in contrast I,) that is, whereas they will be empty and have no word in them, I am full of (or filled with) power by the Spirit of the Lord and of judgment and might. The false prophets followed their own spirit (Ezekiel 13:3). Their only power or influence was from outside, from favorable circumstances, from adapting themselves to the great or to the people, going along with the tide, and impelling people where they wished to go. The power of the true prophet was inherent, and that by gift of “the Spirit of the Lord.”

And so, while adverse circumstances silenced the false prophets, they called forth even more the energy of the true, whose power was from Him in whose hands the world is. The adverse circumstances for the false prophets were God’s judgments; for the true, they were humanity's stubbornness, rebellion, and oppressiveness. Now was the time of the false prophets; now, at a distance, they could boldly foretell, because they could not yet be convicted of untruth.

When trouble came, they went into the inner chamber to hide themselves (1 Kings 22:25). Micah, amidst the wild tumult of the people (Psalms 65:7), was fearless, upheld by Him who controls, stills, or releases it, to do His Sovereign Will.

I am filled with power - So our Lord commanded His Apostles, “Tarry, until you are endued with power from on high” (Luke 24:49): “you shall receive power, after the Holy Ghost has come upon you” (Acts 1:8); and “they were all filled with the Holy Ghost” (Acts 2:4). The three gifts, “power, judgment, might,” are the fruits of the One Spirit of God, through whom the prophet was filled with them.

Of these, “power” is always strength residing in the person, whether it be the “power” (Exodus 15:6; Exodus 32:11; Numbers 14:17, and others) or “might of wisdom” (Job 36:5) of Almighty God Himself, or “power” which He imparts (Deuteronomy 8:18; Judges 16:5; Judges 16:9; Judges 16:19) or implants. But it is always power lodged in the person, to be put forth by that person.

Here, as in John the Immerser (Luke 1:17) or the Apostles (Luke 24:49), it is divine power, given through God the Holy Spirit, to accomplish that for which he was sent, as Paul was invested with might (2 Corinthians 10:5), casting down imaginations and every high thing that exalts itself against the knowledge of God, and bringing into captivity every thought to the obedience of Christ. It is just that, which is so lacking in human words, which is so characteristic of the word of God, “power.”

“Judgment” is, from its form, not so much discernment in the human being, as “the thing judged,” pronounced by God, the righteous judgment of God, and righteous judgment in humanity in accordance with it (Isaiah 1:21; Isaiah 5:7). It was what, he goes on to say, the great men of his people abhorred (Micah 3:9): equity. With this he was filled. This was the substance of his message: right judgment that they were to enact, which he was to urge upon them. On their refusal, this judgment was to be pronounced upon them in the Name of God the Judge of all, and to be executed upon them.

“Might” is courage or boldness to deliver the message of God, not awed or hindered by any adversaries. It is that holy courage of which Paul speaks: that utterance may be given to me, that I may open my mouth boldly, to make known the mystery of the gospel, for which I am an ambassador in bonds, that in it I may speak boldly, as I ought to speak (Ephesians 6:19–20).

So too, after the Apostles had been “straitly threatened that they should speak no more in the Name of Jesus, all, having prayed, were filled with the Holy Spirit, and spoke the word of God with boldness” (Acts 4:18, 31). Dionysius: “Whoever is so strengthened and arrayed, utters fiery words,
By which hearers’ hearts are moved and changed.
But whoever speaks from his own mind, does good neither to himself nor others.”

So then, of the three gifts, “power” expresses the divine might lodged in him; “judgment,” the substance of what he had to deliver; “might or courage,” the strength to deliver it in the face of human power, persecution, ridicule, death.

Lap.: “These gifts the prophets know are not their own, but are from the Spirit of God, and are by Him inspired into them. Such was the spirit of Elijah, unconquered, energetic, fiery, of whom it is said, Then stood up Elias as fire, and his word burned like a lamp . Such was Isaiah, Cry aloud, spare not, lift up your voice like a trumpet, and show My people their transgression and the house of Jacob their sins (Isaiah 58:1).

Such was Jeremiah; Therefore I am full of the fury of the Lord; I am weary of holding in. I have set you for a trier among My people, a strong fort; and you shall know and try their ways (Jeremiah 6:11, 27). Such was John Baptist, who said, O generation of vipers, who has warned you to flee from the wrath to come? (Matthew 3:7). Such was Paul, who, when he (Acts 24:25) reasoned of temperance, righteousness, and judgment to come, made Felix tremble, though unbelieving and ungodly. Such were the Apostles, who, when they had received the Holy Spirit (Psalms 48:8), broke, with a mighty breath, ships and kings of Tarshish. Such will be Elias and Enoch at the end of the world, striving against antichrist, of whom it is said (Revelation 11:5), if any man will hurt them, fire proceeds out of their mouth and devours their enemies.”