Matthew 12v15-21 shows Jesus fulfilling an Old Testament prophecy found in Isaiah 42. His mission was to proclaim Justice (v18) and establish justice (v20). “Justice” is a summary word for the new world that God will create, a world that has begun now as Jesus sets up his kingdom on earth. He will bring this new world about by the power of the Spirit (v18), a gentle and meek character (v19), and a restoration of weak and fragile people.