1. The Christ (for there is only one for the whole world) was justified in God's sight by works, because He perfectly obeyed the law.
It seems odd that Jonathan Prejean would think otherwise. See this post (link) and the comments following including those from "Crimson Catholic" (i.e. Mr. Prejean).
2. No one else can be justified in God's sight by works, for all have sinned (yes, that includes the Christokos) and come short of the glory of God, for there is only one God-man, Christ Jesus.
3. Because of (2), the only way to be justified is by the substition of the clean white garment of (1) for one's filthy rags. That is to say, the only way to be justified in God's sight is by faith in Christ.
4. True and saving faith evidences itself, however, in works. Thus, we may be justified in our own and our brethren's sight by works, though in God's sight only by Christ's righteousness.