9823. 'A breastplate' means Divine Truth shining forth from Divine Good. This is clear from the meaning of 'a breastplate' as Divine Truth shining forth from Divine Good, in this instance within the last and lowest things in progression from inmost ones in the heavens. For the ephod which that breastplate rested on represented the lowest things of the spiritual kingdom, and therefore the lowest things of heaven. The reason why 'the breastplate' has this meaning is that it was tied on over the breast, where the heart lies, and was filled with precious stones, and the heart corresponds to celestial good, which is the good of love to the Lord received from the Lord, while the twelve precious stones correspond to Divine Truths springing from that good. This is the reason why in the highest sense 'the breastplate' means Divine Truth shining forth from the Lord's Divine Good. For the correspondence of the heart to celestial good, or the good of love to the Lord received from the Lord, see 170, 172, 176, 3635, 3883-3896, 7542, 9050, 9300, 9494; and for the correspondence of the twelve precious stones to Divine Truths which spring from Divine Good, see further on in the present chapter where the full description of this breastplate occurs. There it is called 'the breastplate of judgement', also the Urim and Thummim, because of the twelve precious stones with which it was filled. The fact that it was tied on over the breast, where the heart lies, is evident from the description of it below, where that fact is stated explicitly in these words,

Aaron shall carry the names of the sons of Israel in the breastplate of judgement over his heart. Verse 29.

And after this,

They shall be over Aaron's heart, when he goes in before Jehovah. And Aaron shall carry the judgement of the children of Israel over his heart before Jehovah continually. Verse 30.

'Judgement' too means Divine Truth emanating from the Lord's Divine Good, as will be seen in what follows.