The garments of the High Priest were not merely a display of beauty and splendor, but a profound spiritual tool designed to bridge human leadership with Divine guidance. At the center of the Breastplate lay a mystery that transformed it into a direct channel of communication with God, used to make fateful decisions for the entire nation. The primary approach among commentators is that the Urim and Thummim were not physical objects crafted by human artisans. Rather than commanding their creation, the text refers to them as something already existing. They were a Divine secret—a document inscribed with holy names provided directly to Moses by God, which Moses then physically placed inside the fold of the Breastplate's fabric [רש״י, רמב״ן, רבינו בחיי, ביאור יש״ר, ואחרים].
Other perspectives offer different understandings of this mystery. Some suggest that the Urim and Thummim were actually the twelve stones of the Breastplate themselves, named for their naturally illuminating and flawless, uncut state [הכתב והקבלה]. A more historical and practical approach proposes that they were two physical lots used to provide simple yes or no answers to questions of national leadership [קאסוטו]. Another unique view argues that they were scrolls outlining the territorial borders of each tribe, placed within the Breastplate to prevent land disputes [בכור שור]. From a philosophical standpoint, they have been viewed as symbols of natural forces and celestial shapes designed to prepare the mind of the High Priest for prophecy [רלב״ג]. Spiritually, they are also seen as representing the tension between a burning desire to cling to God—represented by the Urim—and the innocent, steadfast devotion to fulfilling practical commandments in the world, represented by the Thummim [חומש קה״ת].
The very names of the Urim and Thummim were derived from how they functioned: they were called Urim because they illuminated their words, and Thummim because they completed and fulfilled their promises [רש״י, תורה תמימה]. The process of receiving an answer operated at the level of the Holy Spirit, a state higher than a heavenly voice but just below standard prophecy. When a leader asked a question regarding public affairs, the High Priest would focus his thoughts on the holy names of the Urim. Through their power, specific letters from the names of the tribes engraved on the Breastplate's stones would light up or protrude. Because these illuminated letters were scattered and did not immediately form a clear word, the High Priest would then focus on the names of the Thummim. This granted his heart the spiritual wholeness and clarity needed to correctly combine the letters into a meaningful sentence [רמב״ן, רבינו בחיי, טור הארוך]. Unlike prophecies of doom, which could be averted if the people repented, the answers received through this method were absolute and final [תורה תמימה, ביאור יש״ר]. In this role, the High Priest acted as the eyes of the entire congregation, bringing hidden mysteries to light and resolving their deepest doubts [כלי יקר].
Carrying the judgment of the Israelites referred to delivering God's future decrees and rulings, guiding the nation on whether to take a specific action or refrain from it [אבן עזרא, רש״י]. Additionally, bearing this judgment served to atone for any errors or miscarriages of justice committed by the earthly courts [רש״י]. The requirement for the High Priest to carry this upon his heart carried a dual meaning. Beyond the physical placement of the Breastplate on his chest, it demanded a deep internal awareness. He was to carry the judgment of the people in his thoughts, constantly reflecting on their needs and praying that they find favor before God [ספורנו, קונטרס חיבה יתירה, חזקוני]. The instruction to bear it constantly did not mean the Breastplate had to be worn without interruption. Instead, it meant that whenever the High Priest entered the Sanctuary to represent the people and seek direction, he had to be adorned with the Urim and Thummim to successfully draw Divine guidance down into the world [ברכת אשר, העמק דבר].