How a Right Understanding of the Doctrine of the Fall Can Promote Love
Jesus identifies with the needy such that whatever is done to or for them, He takes as having been done to Himself. Among other things, to be a disciple of Jesus means, by the grace of God, we must, not only consider this in theory, but do it. This standard is so high that we usually fall woefully short of it, especially when we fail to treat other people as we would have them treat us.
A helpful doctrine to appeal to in this regard is the doctrine of the Fall. Martin Luther was well known for having said that redeemed Christians are "Simul Iustus et Peccator" or "At the same time righteous and a sinner". Although Christ has broken our bondage to sin, we are still susceptible to sins in which we don't treat others as we should. Gossip, as one example, misapprehends the reality that every day you and I (and everyone else), could easily have plenty of fodder that could be a matter of public gossip. Just consider many of the thoughts and desires you had this week, and what if they were to be projected on a screen for all to see? All of us would be ashamed. What if your family and neighbors could see everything you have thought? Why is this worth considering? Because every time we gossip and belittle, criticize and disparage others what we are doing is postulating that others have sin or weaknesses that you regard as not having in yourself. And when we do this are we taking our own sin seriously? We think ourselves too highly. The fact that we continually and desperately need the gospel as much as any other should therefore keep us humble as we consider any good gifts we have. Keeping this in mind, especially when you are communicating the gospel, will drive up your empathy to others, since we are a needy people.
Love or Die: Christ's Wake-up Call to the Church by Alexander Strauch
The Difficult Doctrine of the Love of God by D.A. Carson
How to Love Difficult People: Receiving and Sharing God's Mercy (CCEF)