Mercy is the most fundamental aspect of our relationship with God. We only have a relationship with God because of His tremendous mercy, for without it, we are permanently estranged from Him. Thus, Jesus teaches mercy on our parts as a foundational requirement of being His disciple.
We have received His mercy- we are to show mercy to others when the occasion arises. We have received His love- we are to show love to others. How can we show mercy without love, and love without mercy? Yes, this is fundamental.
The person who has received God’s mercy and who shares it with others, both through the Gospel and through our own attitudes and actions, will in the end, receive mercy when those who have refused it receive God’s judgment; this is also a fundamental truth.
Now we come to the reversal of this: What kind of person does not show mercy to others?
The ruthless, the cruel, the inhumane, the purely evil…
Will they receive mercy: of course not, they will be judged. Will they be blessed in this life by relationship with God? No, for they live in open rebellion against Him. Will they receive mercy in the end? No, they will receive justice instead.