How do we know Urim and Thummim are significant?

The Urim and Thummim symbolize God's direct communication and guidance for Israel. In the context of the text, their absence during the return from Babylon showed a loss of divinely sanctioned discernment. Their integration into the high priest's breastplate signifies that God's will was accessible to His appointed leaders, tasked with representing the people before Him. The New Testament ultimately reveals that Christ embodies the fulfillment of God's revelation, consolidating what the Urim and Thummim represented within Himself as the true wisdom and guidance for believers.