Love makes life work, so put your heart into it.
Above all, keep loving one another earnestly, since love covers a multitude of sins. (1 Peter 4:8 ESV)
1/ Nothing over love unifies.
“Blessed are the peacemakers, for they shall be called sons of God.” (Matthew 5:9 ESV)
By this all people will know that you are my disciples, if you have love for one another.” (John 13:35 ESV)
2/ Nothing over love harmonizes.
 Put on then, as God’s chosen ones, holy and beloved, compassionate hearts, kindness, humility, meekness, and patience,  bearing with one another and, if one has a complaint against another, forgiving each other; as the Lord has forgiven you, so you also must forgive.  And above all these put on love, which binds everything together in perfect harmony. (Colossians 3:12-14 ESV)