and looking back] This is an Hebrew phrase, signifying repentance of that one had begun; see Gen. 19. 17, 26. The meaning is, that no man dedicated to the Ministery of the Gospel, having in his heart a resolution to forsake his Calling, and embrace this present world, is fit for that holy work. The simile is dervied from Ploughmen, who looking backward cannot make streight furrows.