God taught King David, and He wants to teach all His people. Once you begin to apply the spiritual laws of God as taught in the Bible, as magnified by Jesus Christ in the Sermon on the Mount, you can have greater understanding and true knowledge. As we read in Psalm 111:10: “The fear of the Lord is the beginning of wisdom; a good understanding have all those who do His commandments.”
As you seek to obey Him, God will reveal spiritual knowledge to you through the Holy Spirit. Paul goes on to explain the difference between the knowledge of a converted Christian and of an unconverted person: “For who among men knoweth the things of a man, save the spirit of the man, which is in him? Even so the things of God none knoweth, save the Spirit of God. But we received not the spirit of the world, but the spirit which is from God; that we might know the things that were freely given to us of God” (1 Corinthians 2:11–12, ASV).
Just as an animal brain cannot understand the “things of man,” neither can the carnal, natural mind of man understand the “things of God.” Paul goes on to explain: “But the natural man does not receive the things of the Spirit of God, for they are foolishness to him; nor can he know them, because they are spiritually discerned” (1 Corinthians 2:14). Spiritual truth is spiritually discerned; it cannot be acquired by natural human intellect apart from the gift of God’s Holy Spirit (Acts 2:38).