The Arm of the Lord Revealed

What does it mean in verse 37, when the question is asked – "And to whom has the arm of the Lord been revealed? What does the word, "arm" mean here? I believe that the term – God's arm being revealed, refers to Christ, who is His right hand Man. God's right hand and His holy arm, who is Christ, has gained the victory of our salvation, in Him. (Psalm 98: 1) A further question that should come to us then, is this – Why must the arm of the Lord be revealed if a person is to be saved, and to really come to know God? I want to give you two answers to that question.
1st of all – The arm of the Lord must be revealed because without this revelation, God's way of salvation in Christ will be rejected. (verses 38 & 39) And 2nd – The arm of the Lord must be revealed because of man's need to receive efficacious grace, which will bring him to faith in Christ. (verse 41) Let's see if we can come to understand these things in the way that God would have us to understand them.