"Made perfect through suffering."
Jesus the author of our salvation learned obedience through suffering. He was sinless, the learning obedience through suffering was for us: to bring us to God. He made this possible by a change of clotting (identity) with Him: To be clothed with immortality by His Spirit. This fulfils the prophesy "I will make a way in the wilderness." Where the generation after the flesh had to die forty years: what obedience passed through in forty days: Jesus in prayer and fasting to put away His enemy.
In the communion of the Last super we partake of His body and cleansing life blood, just before He suffered for us; so that following Him as we are called, "Daily pick up your cross and follow Me." We learn of Him obedience in the things He suffered: in the fellowship of His suffering, losing our life after the flesh to have Life in the Love of God, "If I have not Love I am nothing." If your trying to fulfil the law your trying to save nothing. It's not possible to prove ourselves obedient to follow Him: it's proven impossible. After the disciples followed Jesus 3½ years: in the Communion of the Last super Jesus said to His disciples, " All of you will abandon Me this night." Even having inherited His will in the new covenant, having good will could not bring us to obedience, until empowered by His Spirit. This was foreknown in the mind of God that we had to learn of Him in the fellowship of His sufferings, to cease from our dead works: there was no other way, "If there was a law that could have made us righteous, Salvation would have been by the law." and Jesus would not have had to leave so that we would have His Spirit. "Not by might nor by power but by my Spirit sais the Lord." God caries us into His death to all that is not of God: suffering with Him is not work if we know His Grace: the Love of God working in us, giving us identity in Christ.
Grace enables us to do "One thing," forgetting what lies behind (dead)," and walk in the Light to get more Light.