Paul had just written to the Corinthians that, while knowledge (even knowledge of spiritual things) makes a person feel important, it is love that actually builds up the Church. Knowledge alone is not enough.
“If any man think that he knoweth anything, he knoweth nothing yet as he ought to know. But if any man love God, the same is known of Him.” 1 Corinthians 8:2,3 KJV
If we think” we know”, Paul is saying, we haven’t grasped the fundamental truth that what really counts is whether God knows us. Jesus Himself, in the Sermon on the Mount, made the terrifying statement that even some people who could prophesy or cast out demons in Jesus’ Name will be denied entrance to the Kingdom of Heaven– because He does not know them. Spiritual knowledge and power, even as great as this, means nothing if we are not known by God.
In this passage, Paul states simply that the man who loves God is known by Him. It is that one single relationship that matters above all else. If we love God, He knows us; that is worth more than all the right spiritual answers, all the knowledge there is about the right way to live the Christian life.
The man who has only knowledge, no matter how exalted, will find that he has nothing in the end. But the man who loves God will be known by God, and will find an open door into the Kingdom of Heaven.