When Peter rebuked Jesus for suggesting that He was going to suffer and be killed, Jesus sternly admonished Peter saying, “You are not mindful of the things of God, but the things of men” (Matt. 16:21-23). In other words, Jesus said, “You’re setting your mind in the wrong place. You’re not setting your mind on God’s thoughts; you’re setting it on man’s thoughts.”
This same Greek word for “being mindful” (phroneo) is found a couple dozen times in the New Testament to emphasize the directing of one’s mind. A faithful Christian is one who will set his/her mind on “the things of the Spirit” (Rom. 8:5), on “one another” (Rom. 12:16), not going “beyond what is written” (1 Cor. 4:6), on the exemplary mind of Christ (Phil. 2:5), “on things above” (Col. 3:2), etc.
Where is your mind? Of what are you mindful? On what is your mind set? The things of God? Or, the things of men? You cannot acceptably be “double-minded”!