1. Those that were ignorant shall become intelligent, v. 18. Those that understood not this prophecy (but it was to them as a sealed book, v. 11) shall, when it is accomplished, understand it, and shall acknowledge, not only the hand of God in the event, but the voice of God in the prediction of it: The deaf shall then hear the words of the book. The fulfilling of prophecy is the best exposition of it. The poor Gentiles shall then have divine revelation brought among them; and those that sat in darkness shall see a great light, those that were blind shall see out of obscurity; for the gospel was sent to them to open their eyes, Acts xxvi. 18. Observe, In order to the making of men fruitful in good affections and actions, the course God's grace takes with them is to open their understandings and make them hear the words of God's book.