"He who has an ear, let him (Whoever has ears, let them) hear what the Spirit says to the churches" (1984, 2011 NIV).
All human beings suffer from a selective hearing disorder. No one ever forgets a pretty girl saying to them, "You're cute." But when our boss calls us into his office to chew us out, we tune him out and don't hear well. We also have selective spiritual hearing disorder. No Christian ever dislikes hearing, “The Lord bless you and keep you; the Lord make his face shine on you and be gracious to you; the Lord turn his face toward you and give you peace” (Num 6:24-26). But will we listen if God says, as he does to the church in Laodicea, "...because you are lukewarm--neither hot nor cold--I am about to spit you out of my mouth. ...you do not realize that you are wretched, pitiful, poor, blind and naked" (Rev 3:16,17)? To stress the utmost importance of listening to the Spirit, Jesus repeats 7 times to the 7 churches the exact same plea: "He who has an ear, let him (Whoever has ears, let them) hear what the Spirit says to the churches."