True love—the sacrificial, beneficial kind—is the mark of the true believer (v. 7), those who do not love do not belong to God (v. 8), God loved us before we loved Him (vv. 9-10), and all of this is why we should love one another and thereby prove that we are His (v. 11-12).
Inibig tayo ng Diyos bago natin Siya inibig (vv. 9-10); at ito ang dahilan kung bakit dapat nating ibigin ang isa't isa - upang patunayan na tayo ay sa Kanya (v. 11-12).