That the teacher or preacher of the gospel, sent and authorized by God, may by the study of the scripture be furnished for all turns, enabled to discharge his whole duty toward the souls of others. Which may therefore stir up every man to be emulous of the best, to be sure to rid himself from these pollutions of the Gnostics; and then, as he shall be more valued by Christ, so he shall be fitter to serve him in purity and every other Christian duty.