1 Corinthians 13 4-8,
"Love suffers long and is kind; love does not envy; love does not parade itself, is not puffed up; does not behave rudely, does not seek its own, is not provoked, thinks no evil; does not rejoice in iniquity, but rejoices in the truth; bears all things, believes all things, hopes all things, endures all things.
Love never fails."
Explains why love is the greatest gift. Love is the main thing God expects from us as christians. He tells us we would love him and others.