But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you.
Ver. 17. That form of doctrine] Gr. "That type or mould;" the doctrine is the mould, hearers the metal, which takes impression from it in one part as well as another. And as the metal hath been sufficiently in the furnace, when it is not only purged from the dross, but willingly receiveth the form and figure of that which it is cast and poured into, so here.