Contemporary English Version (CEV)
Often, when we're kind to others it is because they were first kind to us, or because they can help us in some way, or perhaps because they are like us. Our reasons for kindness are often muddied.
Here, we are called to love one another sincerely because of the love God has shown for us. We who have been richly loved are called to extend the same love to others. Not in hopes of future gain, but simply because that's how we should behave in response to the great love by which God loves us. God loves us enough to send his son, Jesus Christ, to die for our sins, to accept our punishment while sharing with us his great reward. No greater love than this is possible, and this selfless, sacrificial love is the type we should strive for when we think about how to treat those around us. We should not consider ourselves, but rather the needs of others, and love with all of our hearts, and to keep on doing this, even beyond the point of exhaustion.