We have electromagnetic waves passing through us all the time. Radio waves, television waves, Wi-Fi, and the cell phone network are only a few examples. As these waves pass through us, they are totally undetected by us. They have no meaning. Why? Because our bodies are unequipped to interpret their meaning and translate them into sound or images or computer data.
This is a bit like the spiritual realm. When Biblical truth is taught, there are many who simply don’t understand. Why? Because they are natural men. “The natural person does not accept the things of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned” (1 Corinthians 2:14). They cannot understand.
But, the spiritual person is able to hear and understand and believe. “We have received not the spirit of the world, but the Spirit who is from God, that we might understand the things freely given us by God” (1 Corinthians 2:12). It is as if God gives spiritual antennas to some, so that they understand. Praise be to God.