Hebrews 5:8

Even though Jesus was the Son of God (Son though He was), and as such perfect in one sense, He gained something through His sufferings. He gained experiential knowledge of what being a human involves. Similarly Jesus grew in favor with God and man (Luke 2:52). He learned obedience in the sense that He learned to obey His father’s will as a human. For Jesus, God’s will involved suffering (cf. Philippians 2:6-8).

"Innocence is life untested, but virtue is innocence tested and triumphant." [Note: Thomas, p. 64.]

"Here the remarkable thing is that Jesus had to suffer, not because but although he was huios [son], which shows that Jesus is Son in a unique sense; as applied to Jesus huios means something special. As divine huios in the sense of I1f [Hebrews 1:1-2], it might have been expected that he would be exempt from such a discipline." [Note: Moffatt, p. 66.]