Revelation 2:3-5

and [I know that] you [who believe] are enduring patiently and are bearing up for My name’s sake, and that you have not grown weary [of being faithful to the truth]. But I have this [charge] against you, that you have left your first love [you have lost the depth of love that you first had for Me]. So remember the heights from which you have fallen, and repent [change your inner self—your old way of thinking, your sinful behavior—seek God’s will] and do the works you did at first [when you first knew Me]; otherwise, I will visit you and remove your lampstand (the church, its impact) from its place—unless you repent.