“Therefore everyone who hears these words of mine and puts them into practice is like a wise man who built his house on the rock. The rain came down, the streams rose, and the winds blew and beat against that house; yet it did not fall, because it had its foundation on the rock. But everyone who hears these words of mine and does not put them into practice is like a foolish man who built his house on sand. The rain came down, the streams rose, and the winds blew and beat against that house, and it fell with a great crash.” Matt 7:24-27
Or some accept it for awhile but then reject it later (Matt 13:18-23, 2 Pet 2:20-22), or hear the words, believe, but then fail to profess that faith (John 12:42).