on forsaking your first love...

what does it mean to forsake your first love?
like the 'lukewarm Christian' question, this comes up in Revelations 2-3.
'forsaking your first love' means to forsake the -true Gospel-.  people usually assume that the 'first love' is Jesus Christ...but i have never seen that in anyone.  every believer i know first falls for the Gospel, and later, over many years, maybe falls for Jesus Christ.  no, i truly believe that the Gospel is our 'first love'.
the Ephesians had accepted the Gospel with joy and had lived with freedom.  they had deeds, they endured hardship, they removed false teachers, lots of great stuff.  ...but they had forsaken their first love.
i see this ALL THE TIME with new believers.  they start out with just the Gospel; they enjoy a period of sublime peace and really enjoy their relationship with God.  but after a little while, they start wondering 'what they should do' and 'what God wants from them'.  the result is that they look to add something to the Gospel - this is, almost inevitably, the Law.

Takeaway
forsaking your first love is forsaking the true Gospel, generally by adding the Law to it.
Application
it is suitable to hang onto the true Gospel.