A ''believer" has knowledge of God's revealed will, each individual acting as the divine Spirit leads according to His nature i.e. -Love. While in human flesh, known as Son of God, Jesus said '' He who loves me will be loved by my Father, and I too will love him and reveal myself to him." As simply as it is , the apostle explaines, 'for who has known the mind of the Lord, so as to instruct him? But we have the mind of Christ."
Obviously, the mind of believers is revealed in their deeds - as showed by the man of Nazareth; while the rest of the world's mind is mere oposition to that of the Creaor's will.