Rev 2:1-5 "To the angel of the church in Ephesus write: 'The words of him who holds the seven stars in his right hand, who walks among the seven golden lampstands. I know your works, your toil and your patient endurance, and how you cannot bear with those who are evil, but have tested those who call themselves apostles and are not, and found them to be false. I know you are enduring patiently and bearing up for my name's sake, and you have not grown weary. But I have this against you, that you have abandoned the love you had at first. Remember therefore from where you have fallen; repent, and do the works you did at first. If not, I will come to you and remove your lampstand from its place, unless you repent."
Rev 3:14 "And to the angel of the church in Laodicea write: 'The words of the Amen, the faithful and true witness, the beginning of God's creation. I know your works: you are neither cold nor hot. Would that you were either cold or hot! So, because you are lukewarm, and neither hot nor cold, I will spit you out of my mouth."
Moderate love is a sin. Maybe a damning sin.