'The liver,' as in Exodus 29:13, signifies interior purification, and 'the caul above the liver,' the inferior good of the external or natural self.

(Referencias: Arcana Coelestia 10031)

285. There are two inmost things of heaven, namely, innocence and peace. These are said to be inmost things because they proceed directly from the Lord. From innocence comes every good of heaven, and from peace every delight of good. Every good has its delight; and both good and delight spring from love, for whatever is loved is called good, and is also perceived as delightful. From this it follows that these two inmost things, innocence and peace, go forth from the Lord's Divine love and move the angels from what is inmost. That innocence is the inmost of good may be seen in the preceding chapter, where the state of innocence of the angels of heaven is described. That peace is the inmost of delight from the good of innocence shall now be explained.