SERMON NOTES: 1/29/12
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Deuteronomy 18:15-20
How Do We Know?
INTRODUCTION: A group of children were asked to name the most amazing invention of all time. The answers were about what you would expect – iPods and iPads, Wii and Xbox and the like. But then one little boy said the Thermos. The surprised teacher asked him why he thought the Thermos was the most amazing invention of all time, and he said, “It keeps hot things hot. It keeps cold things cold.” “What’s so amazing about that?” the teacher asked, to which the little boy responded, “How do it know?”
As Christians, we believe a lot of stuff about God and Jesus, about the Spirit and the church, about forgiveness and how to live and where we are going. But how do we know? How can we be so sure that what we believe is true and accurate and right?
We can know because we are told. The Scripture we read this morning relates to this question, so let us consider what Moses says in this chapter of Deuteronomy. In it I think we will discover the truth of what C.S. Lewis said, “I believe in Christianity as I believe that the sun has risen: not only because I see it, but because by it I see everything else.”[1]
I. First of all, we read of a promise given by God through Moses stating that God will raise up a prophet or prophets. Prophets are those who speak forth the Word of God, which may or may not include predictions of what will happen in the future. God says of these prophets, “I will put My words in the mouths of the prophets, who shall speak to [the people] everything that I command.” This passage has been understood on two levels. First, that God will regularly and always send prophets to His people. These are those who will speak forth the true Word of God. The second understanding is that this refers specifically to Jesus, the ultimate prophet. Now these two understandings are NOT mutually exclusive. The fact is that both are true. In every time, God sends prophets to speak His Word. And at the right time God sent into the world His only begotten Son, Jesus – one of whose roles was to be the prophet of all prophets.
God promises to send prophets, but He also tells us in this passage that we are to listen to God’s prophets, “Anyone who does not heed the words the prophets shall speak in my name, I Myself will hold accountable.” In other words, when we are given the Word of God, we better pay attention to it. It is not me or the elders of the church or higher church courts that will render judgment if anyone fails to listen to what the Word of God says. God Himself is the judge. God Himself renders the verdict. We are accountable to Him, and I don’t think He is going to want to hear, “I didn’t know,” or “I wasn’t paying attention.”
In addition to the command to listen to God’s Word, there is a warning to the prophets themselves, “Any prophet who speaks in the name of other gods, or who presumes to speak in My name a word that I have not commanded the prophet to speak – that prophet shall die.” Those in every age who are called to speak the Word of God bear a heavy responsibility. We are not to misrepresent God’s Word. We are not to make the words of “other gods” – be they other religions, philosophies, social conventions, political expediency, or any other word – we are not to make them equivalent to or replacements of the Word of God that has been delivered to us.
God promises to speak to us. He commands us to listen to Him. And He warns us not to speak any false word and claim it is His.
II. But how do we know if what a prophet says is true, right, really from God? This is the pertinent question whether that prophet lived in Old Testament times, in Jesus’ day, at any time in church history, or in our own day. How do we know? There are two tests, according to the passage we read today, “If a prophet speaks in the name of the Lord but the thing does not take place or prove true, it is a word that the Lord has not spoken.”
So, first of all, the prophecy will come to pass. One source cites that of approximately 2,500 prophecies in the Bible, 2,000 have already “been fulfilled to the letter.”[2] Another source lists 351 prophecies in the Old Testament that refer to the Messiah and which have been fulfilled in Jesus the Christ.[3] If the prophecy includes some detail of the future, and if it is a true prophecy, it will happen.
III. But not every prophecy, not every word of the Lord is a prediction of some event to come. Most prophecy is the speaking forth of God’s Word. Most of it tells us what we need to do. Most of it informs us of God’s standards, commands, and warnings. The test for this type of prophecy is simply this: Does it prove true?
What does that mean? Two things: one, it is consistent with the whole council of God as found in the Bible. God will never deliver to any prophet a word that is contrary to what He has already told us in the Bible. “God is the same, yesterday, today, and forever.”[4] Therefore His Word is going to be the same. So if somebody comes to you saying that God has changed His mind about morality or faith or His commandments – run, do not walk, run away from that person! (You don’t want to be there when the lightning strikes.) Here is an example I’ve given before. A man comes to his pastor and says, “God told me,” so he is claiming to have a word from the Lord, “God told me to leave my wife and marry my secretary.” No, He did not!” Malachi 2:15 – “Do not let anyone be faithless to the wife of his youth.” Jesus, after quoting Genesis, said of husband and wife, “So they are no longer two, but one flesh. Therefore what God has joined together, let no one separate.”[5] Test every word that is claimed to come from God. If it is true, it will agree with what it says in the Bible.
Does it prove true? The second way to judge that is this: does it work? Does what God tells us by the Word He gives through His prophets actually work? Perhaps the most blatant example of using this principle is proclaimed by God Himself in Malachi. “Bring the full tithe into the storehouse … and thus put Me to the test …; see if I will not open the windows of heaven for you and pour down for you an overflowing blessing.” There are many places in God’s Word that tell us we are to be faithful in tithing. Here God actually says, “Try it and see if it works!” Pay your tithe, and watch the blessings flow.
This works in every area. When we live by God’s economic standards, our needs are met. Try living by God’s moral standards, and we will be safer, healthier, and have better self-esteem. Walk by the rule of faith, and peace and confidence will follow. In every aspect of life, if we live by God’s Word our lives will be better. I even heard of an Episcopal priest who used to say to unbelievers, “Live for one year as if the Gospel were true. If at the end of that time you can honestly tell me your life is not better, I will leave the priesthood.”
That doesn’t mean that everything will be easy for us. Sometimes we have to go through tough times, even walk through the valley of the shadow of death, but if we are walking with God, then we have no need to fear. God will not only see us through, He will provide for all our needs.
CONCLUSION: Psalm 111 says, “The fear of the Lord is the beginning of wisdom.” To “fear God” means to stand in awe of Him, to recognize His majesty, glory, and power. If we do this, then we will have the wisdom to recognize His Word when we hear it. We will also know to reject the false words, false teachings, and false prophecies of those who would deceive us. C.S. Lewis once said, “If you look for truth, you may find comfort in the end; if you look for comfort you will not get either comfort or truth – only soft soap and wishful thinking to begin, and in the end, despair.”[6]
God has promised to raise up prophets. Look for them. God will give His Word to the prophets. Listen to them. But there are false prophets out there as well. Test them. If we learn how to distinguish God’s true Word from the lies of the imposters, then we will have God’s own guidance for our lives and blessings will abound for us in His Word. Amen.

