as children of obedience, not conforming yourselves according to your former lusts as in your ignorance,
not fashioning yourselves according to the former lusts in your ignorance: The word "fashioning" has to do with appearances. The Greek word is suskeematizomai, meaning "to give the same appearance as, to conform to" (Vine, Vol. II 80). It is the same idea Paul has in mind in Romans 12:2. The word "lust" (epithumia) denotes "a desire for what is forbidden" (Thayer 238-2-1939). Vine says "ignorance" (agnoia) "is of the former unregenerate condition of those who became believers" (Vol. II 245). It deals with our tendency to conform to the world in speech, dress, and manner of life.