Ultimately, no sign, miracle, wonder, or gift will persuade a person to believe if God has not opened his heart to receive the word (cf. Acts 16:14; Lk. 16:27-31)… Many who see signs will at first appear to believe, yet will still be unconverted. “Many believed in His name, observing the signs which He was doing,” said John. “But Jesus, on His part, was not entrusting Himself to them” (John 2:23-24). Why not? John says it was because Jesus knew their hearts (v. 25). Seekers may be entranced by the miraculous and look as though they are true believers, yet still be unchanged in their hearts.