Revelation 2:4

"But I have this against you, that you have abandoned your first love."

The church in Ephesus was loved deeply by Christ, but was warned about what would follow losing their "first love." The following churches that suffered rebuke were experiencing what Christ warned against: they followed strange doctrines (heretical teaching) into judgment. There are so many goals and desires that we seek in this world, they can lead our hearts away from our First Love. Don't let go!

"The life we live on earth has its own attractions as well, because it has a certain beauty of its own in harmony with all the rest of this world's beauty. ... All these things and their like can be occasions of sin because, good though they are, they are of the lowest order of good, and if we are too much tempted by them we abandon those higher and better things, your truth, your law, and you yourself, O Lord our God. For these earthly things, too, can give joy, though not such joy as my God, who made them all, can give, because honest men will rejoice in the Lord; upright hearts will not boast in vain."
— St. Augustine Confessions, ii:5