Kindness is a positive quality and behavior of treating others in a kind, fair, caring manner; being friendly, generous, considerate, and charitable in word and deed. True kindness is an altruistic virtue and act done with no ulterior intent, coming from a place of love in the heart.
Kindness is one of the fruits of the Holy Spirit. The fruits of the Spirit are perfections that the Holy Spirit forms in us as the first fruits of eternal glory. The tradition of the Roman Catholic Church lists twelve of them.
Kindness has a positive impact in the world; just as violence often leads to more violence, kindness often leads to more kindness. Individuals such as Mother Teresa have had a huge impact on the world with their kindness. All individuals have the opportunity to impact many people with our kindness toward themselves and others. 
- Ephesians 4:32 "Be kind and compassionate to one another, forgiving each other, just as in Christ God forgave you."
Kindness is a Fruit of the Spirit (Gal. 5 22-23). In the Old Testament (I and II Samuel), Jonathan showed kindness in his relationship with David (Yes, the one that killed Goliath and ruled Israel as a King for over 40 years). Jonathan and David were best friends. One day, Jonathan spoke to his father, King Saul, in regard to David’s life. Why you may ask? Well, King Saul was jealous of David, so he wanted him dead! However, kind-hearted Jonathan reminded Saul of how reliable David had been to him. And because of Jonathan’s kindness, David’s life was spared. Later on, David remembered the kindness shown to him by Jonathan and in turn, showed kindness to Jonathan’s son. Sometimes, it may be hard to show kindness. Nevertheless, you’re to be kind to everyone, even when you don’t feel like it. ~Fly Ty and Jacinda's Daily Devotion
- Study Love: And Is Kind, an analytical outline of "and is kind" (χρηστεύεται) in 1 Cor. 13:4.