John 13:35
This is how all people will know that you are my disciples, if you have love for one another — the repetition with slight variation emphasizes that love is the singular, non-negotiable mark of discipleship; there is no other credential, no other proof that one truly follows Jesus. The universality ("all people") suggests that love is the language all humans speak, the deepest recognition of the sacred when encountered. A community shaped by the new commandment becomes a beacon; its very existence testifies to the presence and power of Jesus' love in the world.