Romans 12:2

Do not conform. “Conform” refers to assuming an outward expression that does not reflect what is really inside, a kind of masquerade or act. The word’s form implies that Paul’s readers were already allowing this to happen and must stop. this world. Better translated, “age,” which refers to the system of beliefs, values—or the spirit of the age—at any time current in the world. This sum of contemporary thinking and values forms the moral atmosphere of our world and is always dominated by Satan (cf. 2Co 4:4). transformed. The Gr. word, from which the Eng. word metamorphosis comes, connotes a change in outward appearance. Matthew uses the same word to describe the Transfiguration (Mt 17:2). Just as Christ briefly and in a limited way displayed outwardly His inner, divine nature and glory at the Transfiguration, Christians should outwardly manifest their inner, redeemed natures, not once, however, but daily (cf. 2Co 3:18; Eph 5:18). renewing of your mind. That kind of transformation can occur only as the Holy Spirit changes our thinking through consistent study and meditation of Scripture (Ps 119:11; cf. Col 1:28; 3:10, 16; Php 4:8). The renewed mind is one saturated with and controlled by the Word of God. good, pleasing . . . perfect. Holy living of which God approves. These words borrow from OT sacrificial language and describe a life that is morally and spiritually spotless, just as the sacrificial animals were to be (cf. Lev 22:19–25).

Taken from NIV First-Century Study Bible