—3 John 5-6 (NASB)
How does "acting faithfully" become transformed into being called "your love"? Isn't that an odd way of describing things? First he compliments them on their faithfulness—their adherance to the attitude and behavior one would expect of Christians—but further states that this behavior resulted in a testimony to their love.
Throughout the Bible a recurring example of a right relationship with God is marital faithfulness. Believers and the church are described as a bride. Whenever His people wander from Him in pursuit of anyone or anything to take His place, they are described as being unfaithful. A bride demonstrates her love and devotion through the obedience and boundaries of her faithfulness—an adultress does not.
When others see or experience our faithfulness to Him they cannot help but notice how they in turn are being treated with the love and respect and attention of a focused bride devoted to her husband. In being faithful to Him, our faithfulness rubs off in our dealings with others. It is love in action.
We are commanded to love others as Christ loved us. If we struggle with loving others, perhaps it's because we're struggling being faithful to Him.†††