These words (in Rev. 24.) were addressed to the Christian believers at Ephesus. The "first love" does not refer to any person or influence other than Christ, but simply means that the Ephesians had lost the intensity of their affection and zeal for Christ. The Ephesian Church had had special opportunities and blessing. Under Paul's ministrations its members had received the gift of the Holy Spirit (Acts 19:1-6); the apostle had resided with them for three years (Acts 20:31); he had later written to them what is perhaps his most spiritually exalted epistle. Their experience of love for Christ had been warm and keen. In his message sent them through John the Master is reproving them for having allowed their love for him to grow weak and cold.