We hear from the prophet Amos in our first reading for this Sunday. Amos stands at the very beginning of the great prophetic tradition of social justice. He sees that the very heart of the law is our collective concern for the orphan, the widow, the stranger, and the needy. This emphasis is continued in the writings of Isaiah, Jeremiah, and Ezekiel, and it comes to particularly rich expression in the words of Jesus the prophet. We must listen with attention to Amos and allow ourselves to be deeply challenged by him.