I do not set aside the grace of God, for if righteousness could be gained through the law, Christ died for nothing!”
Galatians 2:21 (NIV)
If sin is missing the mark, we should consider that “the mark” is not trying to be perfect or getting ourselves to not sin. It is God’s holiness + righteousness. The only way to God’s holiness is through ongoing relationship with Jesus and the humble acceptance of His grace.