What does the Bible say about losing your first love?

In Revelation 2:4, the Lord Jesus addresses the church in Ephesus for having left their first love. This first love is described as the initial fervor and appreciation for the Gospel, recognizing Christ's sacrifice and the grace extended to sinners. It’s a condition where the believer fully understands their need for a Savior and treasures the relationship with Christ above all else. Losing this love can lead to spiritual decline, and the church is cautioned to remember from where they have fallen and to repent.