In these closing words of His sermon Jesus was stressing the importance of an adequate foundation, and He is asking the question, "What is your foundation? On what do you build?”

What matters is the reality of your own personal commitment to Jesus. Are you a Christian? Is it real? The answer to that question does not depend upon your intellectual beliefs ("Lord, Lord") or upon your good works ("Have we not prophesied in thy name?"), but upon your relationship to the Lord Jesus. Have you ever asked Him to be your Savior? Have you ever said, "Lord Jesus Christ, I want you to enter my heart?" If you have never done that, then you must know that this is the gate to salvation. If you have, then you can be assured that He has entered your life. For He has said, "Blessed are they who do hunger and thirst after righteousness; for they shall be filled" (Matt. 5:6). He says, "Him that cometh to me I will in no wise cast out" (John 6:37). 

Because a man can believe certain Christian doctrines with his head and yet still not be converted, there will always be counterfeit or nominal Christians in Church circles. Some of them will be dangerous, for they will be planted there by the devil to deceive the unwary, like tares in fields of wheat. Others will only be self-deluded. Whatever the case, however, the world will be able to point to them and say, "Ah look at those hypocrites; that's why I'm not a Christian." Don't be discouraged by that. Just be sure that you are not one of them. If you are not to be, you must ask the Lord to reveal the state of your own heart before Him and lead you to the fullness of belief in Christ and commitment to Him.

I do not like the phrase "cheap grace," which Dietrich Bonhoeffer has made popular and which he deplores. For grace in a very real sense is cheap, or, what is even better to say, is without cost entirely. It is true that grace cost God the Father the death of the Son. But for us grace is bestowed totally without payment, and it is abounding even though we fall back into sin or abuse it. I believe that without an explanation the term "cheap grace” obscures this. Nevertheless, the phrase has some value. We can refer to it profitably now at this point in our studies on the final verses of the Sermon on the Mount. 

The second test does not come from the Sermon on the Mount itself—although Jesus Christ also referred to it elsewhere—but from the writings of Jeremiah. False prophets do not have disturbing doctrine in their messages, even though the true state of man demands it. Instead, their message is one of false peace.