What good does it do to speak with high-sounding intellectual statements if people don't understand?
It accomplishes nothing. High-sounding, intellectual, perfectly formed statements are useless when hearers do not know what is being said. The Word of God is simple, and the gospel should be laid out in plain language so a child or someone who has never heard it can understand what it takes to gain heaven.
Les teaches that Paul is making this point: coming in with high-sounding, intellectual, perfectly formed statements does no good if people don't know what you're talking about. Les prays that every time he teaches, he can take these same truths and keep them so simple that a six-year-old can understand. He illustrates this by explaining the gospel to a man who had never heard it, putting it in such simple language that the man went down his driveway with no doubt about what it would take to gain heaven. Whether the man responds or not, he will stand responsible someday because it was laid out as plain and simple as it can be. Les notes that most people have never heard it. Then in verse 10 Paul says there are many kinds of voices in the world, and none is without signification—communication must have meaning, just as even animals communicate and understand each other.