Acts 2:41

41.They, therefore, which willingly. Luke showeth more plainly how fruitful this one sermon which Peter made was: to wit, that it gained unto Christ about three thousand men. And therewithal he declareth the nature and force of faith when he saith, that with a prompt and ready (136) mind they embraced his word. Therefore, faith must begin with this readiness and willing desire to obey. And because many do show themselves at the first very willing, who afterward have in themselves no constancy or continuance, lest we should think that it was some sudden pang (137) which by and by fell away, Luke doth also afterward commend their constancy, who (as he said) did willingly embrace this word of the apostles, showing that they were joined unto the disciples, or that they were engrafted into the same body, and that they continued in their doctrine. Therefore we must neither be slow to obey, nor yet swift to leap back; but we must stick fast, and stand stoutly to that doctrine which we did forthwith (without any tarriance [delay]) embrace. Furthermore, this example ought to make us not a little ashamed. For whereas there was a great multitude converted unto Christ with one sermon, an hundred sermons can scarce move a few of us; and whereas Luke saith that they continued, there is scarce one amongst ten that doth show even a mean desire to profit and go forward, yea, rather, the more part doth soon loathe our doctrine. Woe be, therefore, to the sluggishness and lightness of the world!