I

God does His work of judgment in the last days by appearing in His incarnate identity. The one who is judged is man, man who is of the flesh and has been corrupted, and it's not Satan's spirit that is judged directly, therefore, the work of judgment is not carried out in the spiritual realm, but among man. No one is more suitable, and qualified, than God in the flesh for the work of judging the corruption of man's flesh. If judgment were carried out directly by the Spirit of God, then it would not be all-embracing, and, moreover, man would have difficulty accepting this, for the Spirit is unable to come face-to-face with man. Just in light of this point, the effects would not be immediate, much less would man be able to behold the unoffendable disposition of God more clearly.

II

Satan can only be fully defeated if God in the flesh judges mankind's corruption. God in the flesh is also a person with normal humanity, and He can directly judge man's unrighteousness; this is the mark of His holiness and singularness. Only God is qualified to, and is in the position to, judge man, for He is possessed of the truth, and righteousness, and so He can judge man. Those who are without truth and righteousness are not fit to judge others. If this work were done by the Spirit of God, then it would not mean victory over Satan. The Spirit is inherently more exalted than mortal beings, and the Spirit of God is inherently holy, and triumphant over the flesh. If the Spirit did this work directly, He would not be able to judge all of man's rebelliousness and could not reveal all of man's unrighteousness.

III

The work of judgment is carried out through man's notions about God, and man has never had any notions about the Spirit, and so the Spirit is incapable of better revealing man's unrighteousness, much less of thoroughly exposing such unrighteousness. The incarnate God is the enemy of all those who don't know Him. Through judging man's notions and opposition to Him, He exposes all the rebelliousness of mankind. The effects of His work in the flesh are more apparent than those of the work of the Spirit. And so, the judgment of all mankind is not carried out directly by the Spirit but is the work of the incarnate God. God in the flesh can be seen and touched by man; God in the flesh can completely conquer man. Man progresses from opposing Him to submitting to Him, from persecuting Him to accepting Him, from having notions about Him to knowing Him, and from rejecting Him to loving Him—these are the effects of the work of the incarnate God.

from The Word, Vol. 1. The Appearance and Work of God. Corrupt Mankind Is More in Need of the Salvation of the Incarnate God