What does Exodus 28:30 mean?

Put the Urim and Thummim into the chest piece, so Aaron will always have them over his heart when he comes before the Lord. This way, Aaron will always carry the means for making decisions for Israel close to his heart when he stands before God. Exodus 28:30 - Modern Text Bible

(The Urim and Thummim were sacred objects used to seek God's guidance. The priest keeps them close, showing the importance of seeking God's will for the people.)