If we take their focus off the genuine Light of the World (John 8:12), we run the risk of being blinded by the lusts of the world and the pulls of the flesh.
God proclaims a cause-effect relationship between sin and madness, blindness, and confusion of heart. Sin causes blindness, and blindness begets more sin.
Clear vision lights the way spiritually. If the eye of the heart is aimed at spiritual treasure and the glory of God, it will remain singly focused.
God has placed us all in the body where it has pleased Him. We dare not imitate Satan by letting self-centered goals eclipse God's purpose.