Love One Another
According to John Wesley’s Notes on the NT, loving one another is a never-ending Christian obligation. It is also the essence of Christian ethics and behavior. When we avoid violating a particular law, the letter of the law is observed. But when we love another, the underlying spirit of the law is fulfilled. In John 14:15 and 21, Jesus links loving him to obeying what he commands, so that love is the only law in our relationships – with oneself, with neighbors, with enemies, with creation, and with God. In practice, it means promoting the highest good of others and not causing harm.
-Wesley Study Bible pg 1383