Romans 12:21

Be not overcome of evil--for then you are the conquered party. but overcome evil with good--and then the victory is yours; you have subdued your enemy in the noblest sense. Note, (1) The redeeming mercy of God in Christ is, in the souls of believers, the living spring of all holy obedience (Rom 12:1). (2) As redemption under the Gospel is not by irrational victims, as under the law, but "by the precious blood of Christ" (Pe1 1:18-19), and, consequently, is not ritual but real, so the sacrifices which believers are now called to offer are all "living sacrifices"; and these--summed up in self-consecration to the service of God--are "holy and acceptable to God," making up together "our rational service" (Rom 12:1). (3) In this light, what are we to think of the so-called "unbloody sacrifice of the mass, continually offered to God as a propitiation for the sins both of the living and the dead," which the adherents of Rome's corrupt faith have been taught for ages to believe is the highest and holiest act of Christian worship--in direct opposition to the sublimely simple teaching which the Christians of Rome first received (Rom 12:1) --(4) Christians should not feel themselves at liberty to be conformed to the world, if only they avoid what is manifestly sinful; but rather, yielding themselves to the transforming power of the truth as it is in Jesus, they should strive to exhibit before the world an entire renovation of heart and life (Rom 12:2).

— Jamieson-Fausset-Brown Commentary (public domain)