Galatians 2:17
But if, while we seek to be justified by Christ, we ourselves also are found sinners, is therefore Christ the minister of sin? God forbid. But if, while we seek to be justified by Christ, we ourselves also are found sinners, is therefore Christ the minister of sin? God forbid.
Seeking to be justified by Christ does not make Christ a servant or promoter of sin even when those who seek are themselves found to be sinners, and the suggestion is answered with an emphatic no. Building again what was destroyed, or returning to what was abandoned, is what makes a person a transgressor. Dying to the law and being dead to the law through the law is what makes it possible to live unto God.
The verse means being crucified with Christ and yet living because Christ lives within, living in the flesh by faith in the Son of God who loved and gave Himself. It teaches not to frustrate the grace of God, because if righteousness came through the law then Christ died in vain. Christ is formed within as the hope of glory by eating the Word of God as His flesh and blood and receiving the bread from heaven as Christ Himself. By this believers become partakers of the divine nature through obedience, are enlightened and given light and understanding, are renewed in the spirit of the mind, and grow up into Christ as the living Head.
As the body must be daily renewed with blood by food and the branch must stay united fiber by fiber to the vine in order to bear fruit, so the Word must be eaten daily as meat and drink for nourishment, vitality, and healthful piety. Christ does not promote or excuse sin while justifying sinners. His blood avails for repentant sinners who seek refuge in Him, but it gives no peace, assurance, or genuine hope to those who ignore God's law and reject its claims.
Office in the ministry does not make sin less offensive, and sin in those called to the ministry does not lose its offensiveness because of the power vested in them through office. Sin in ministers is especially grievous and exceeding sinful, because by sinning they make themselves ministers of sin and agents of Satan through whom he can work with success to perpetuate sin.