Outwardly Conforming (συσχηματίζω)
‘Outwardly conforming’ (συσχηματίζω) means to put on a mask to appear as something you’re not. It is to conform one’s mind and character to another’s pattern.
‘Suschēmatizō’ (συσχηματίζω) is derived from a Greek word that means to assume an appearance or likeness of something else. When God the Son wrapped Himself in flesh, He was found in the likeness of a man, yet He was still fully God. He emptied Himself of His outward display of Deity and wrapped Himself in flesh (Philippians 2:8).
As Christians, we are not part of the world system, for in Christ we are crucified to it, and it to us. However, Christ chose not to remove us from it; therefore, we are to use it but not abuse it, realizing that the outward form of the world is always changing (1 Corinthians 7:31). It is the one who does the desirous will of God that abide into the age (1 John 2:17).
In Romans 12:2, we are instructed not to ‘put on a mask’ or outwardly conform ourselves as though we are under law. Christians do not govern their lives by law (Romans 6:14). Law is meant for children, not for sons (Galatians 3:24). Therefore, we are not to be inarticulate babblers who require a tutor, because we are sons, (Ephesians 1:5 - having marked off our bounds to the placement of sons through Jesus Christ unto Himself, according to the good pleasure of His desirous will). In contrast to living by law, we are to train our senses to discern what is proper from what lacks in character and govern our lives by grace out from faith (Hebrews 5:14; Romans 1:17). This standard requires no law because what is produced in the Christian focused on following the desire from the Holy Spirit and living by grace is not against any law (Galatians 5:22-23).
And do not be outwardly conformed to this age, but be transformed by the renewedness of the mind for the purpose that you test for approval what is the desirous will of God, the good and well pleasing and mature - Romans 12:2
As obedient children, we are not to put on a mask to the former lusts in our ignorance. Instead, just as He is holy, we are to set ourselves apart out unto God in all our conduct, 1 Peter 1:14-15.