"A new commandment I give you: Love one another. As I have loved you, so you must love one another. By this all men will know that you are my disciples, if you love one another." ~John 13:34-35

As you look at today's Scripture, think of it this way. The non-Christian world has the right to judge whether or not there is a God by the way we Christians love each other.

Yes, the world will know us by our fruit. Think of ourselves as trees, and if we were bad trees, we would bear bad fruit, but if we are good trees, then we will bear fruit. And the fruit can be regarding as a metaphor for our attitudes to other people around us. There is no greater witness of God's love on Earth than when Christians love in the same manner as Jesus loves.

Here is how historian Aristides described the Christians to the Roman Emperor Hadrian:
"They love one another. They never fail to help widows, they save orphans from those who would hurt them. If they have something, they give freely to the man who has nothing; if they see a stranger, they take him home, and are happy, as though he were a real brother. They don't consider themselves brothers in the usual sense, but brothers instead through the Spirit, in God."

Aristides was describing the kingdom of God made visible by believers.

Therefore, one of the major duties of every Christian is to make the invisible kingdom of God visible.