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.”
These several words such as “rain", "floods", "stream", and "winds", may be the temptations of Satan, the persecutions of the world, the corruptions of a man's own heart. We have to be careful how we build our salvation. If we build on sand the temptation of satan will eventually tear our house down. Even though we have the problems of the world, the question is what are we standing on? Rock or sand.