It was to us that God revealed these things by his Spirit. For his Spirit searches out everything and shows us God’s deep secrets. No one can know a person’s thoughts except that person’s own spirit, and no one can know God’s thoughts except God’s own Spirit. And we have received God’s Spirit (not the world’s spirit), so we can know the wonderful things God has freely given us.
When we tell you these things, we do not use words that come from human wisdom. Instead, we speak words given to us by the Spirit, using the Spirit’s words to explain spiritual truths. But people who aren’t spiritual can’t receive these truths from God’s Spirit. It all sounds foolish to them and they can’t understand it, for only those who are spiritual can understand what the Spirit means. Those who are spiritual can evaluate all things, but they themselves cannot be evaluated by others. For, “Who can know the Lord’s thoughts? Who knows enough to teach him?”
Paul’s confidence was not in his keen intellect or speaking ability but in his knowledge that the Holy Spirit guided him. Paul is not denying the importance of study and preparation for preaching; he had a thorough education in the Scriptures.
Non-Christians cannot grasp the concept that God’s Spirit lives in believers. No one can comprehend God (Romans 11:34), but through the guidance of the Holy Spirit, believers have insight into some of God’s plans, thoughts, and actions—they, in fact, have the “mind of Christ.”
Don’t expect most people to approve of or understand your decision to follow Christ. It all seems so silly to them. Just as a tone-deaf person cannot appreciate fine music, the person who rejects God cannot understand God’s beautiful message. With the lines of communication broken, he or she won’t be able to hear what God is saying to him or her. Through the Holy Spirit we can begin to know God’s thoughts, talk with him, and expect his answers to our prayers. An intimate relationship with Christ comes only from spending time consistently in his presence and in his Word. For more on the mind of Christ, read and meditate on Philippians 2:5-11.