To each of the seven churches of Asia, as found in Revelation 2 and 3, the Lord said that he who has an ear, let him hear what the Spirit says to the churches. Then John wrote later in the Book of Revelation, as he pictured the sea beast for us,

If anyone has an ear, let him hear (Revelation 13.9).

In a Book of the Bible that many do not want to read, and do not want to hear any sermons or instruction from, the Lord tells us repeatedly that we had better listen to it. Are you listening to the message of the Book of Revelation?