The Spirit not only convicts unbelievers of willful sin, but He also convicts the regenerate of "sin improperly so called" (Wesley), a wrong state of the sensibilities lying back of the will. Even after the will has, through the new birth, been brought into an attitude of submission to Christ, there remain tendencies and propensities perilous to the spiritual life and antagonistic to the new principle of love to God which is now enthroned within. This rendered many of the Corinthians "carnal," so that Paul hesitated to call them "spiritual," though they were, "as babes in Christ," possessing a feeble spiritual life instead of that more abundant life which Christ came to impart. This lingering carnality, "the easily besetting" or closely clinging sin, styled by Delitzsch "the indwelling evil," was the force which was impelling many of the Galatians downward instead of upward; for having begun in the Spirit, they were ending in the flesh. We must ascribe to the same cause that lack of perfect loyalty and perfect devotion to Christ in all of Paul's band of missionary helpers in Rome, Timothy excepted, of whom the sorrowful apostle says, "For they all seek their own, not the things of Jesus Christ." By such a remark as this the apostle to the Gentiles does not de-Christianize those members of Christ's body who are still actuated by selfishness. Rather he represents them as weak and defective believers who have not yet submitted to a total self-crucifixion as a prerequisite to perfect love to Christ. Paul does not include himself and Timothy in this class (Phil. ii. 19-21).
— from The Gospel of the Comforter (1898) Chapter 6.