The Apostle Paul:
If anyone else thinks he has grounds for confidence in the flesh, I have more: circumcised on the eighth day, of the people of Israel, of the tribe of Benjamin; a Hebrew of Hebrews; as to the law, a Pharisee; as to zeal, persecuting the church; as to righteousness in the law, faultless. But whatever was gain to me I count as loss for the sake of Christ. More than that, I count all things as loss compared to the surpassing excellence of knowing Christ Jesus my Lord, for whom I have lost all things. I consider them rubbish, that I may gain Christ and be found in Him, not having my own righteousness from the law, but that which is through faith in Christ, the righteousness from God on the basis of faith. I want to know Christ and the power of His resurrection and the fellowship of His sufferings, being conformed to Him in His death, and so, somehow, to attain to the resurrection from the dead. (Philippians 3:4-11).