How do we know that true love exists in Christians?

The existence of true love in Christians is primarily shown through the outward manifestation of the fruit of the Spirit, as highlighted in Galatians 5:22-23. When Christians abide in Christ, they bear the spiritual fruit of love, which can be seen in their interactions and relationships. This love is not merely a feeling; it is an active virtue that 'suffereth long' and is inherently kind. It is a reflection of God’s love for sinners, which is administered to believers through the Holy Spirit, resulting in a transformative effect in their lives that aligns with God's character.