In Genesis 14:1, kings signify apparent goods and truths having the upper hand. In the next verse, they stand for the dominant evils and falsities against which the Lord fought as he passed He grew up on Earth.

In Genesis 14:3, we see that these evils and falsities were unclean; and in Genesis 14:4, that they burst forth later. (Arcana Coelestia 1661-1664).

In Genesis 14:14-15, this signifies that the Lord gained victory over them the evils represented earlier in the chapter. (Arcana Coelestia 1711-1715)

In Isaiah 33:17, a king signifies seeing genuine truth. (Apocalypse Explained 304[31])

In Revelation 9:11, a king signifies one who is in truth from an affection for what is good, and abstractly that truth itself -- here, in the opposite sense. (Apocalypse Revealed 440)

1728. 'And he was a priest' means the holiness of love. This is clear from the meaning of 'a priest' in the Word. Two special ways in which the Lord is characterized are as King and as Priest. A king or the office of king means holy truth, and a priest or the office of priest means holy good. The former is the Divine Spiritual, the latter the Divine Celestial. As King the Lord governs every single thing in the universe from Divine Truth; but as Priest He does so from Divine Good. Divine Truth is the order itself of His kingdom existing everywhere, all the laws of which are truths, or eternal verities. Divine Good is the very essential of order, every aspect of which is an expression of mercy. Both of these - Divine Good and Divine Truth - are attributed to the Lord. If solely Divine Truth were His, no mortal man could be saved, for truths condemn everyone to hell. But Divine Good, which is the essence of mercy, raises people up from hell towards heaven. Divine Truth and Divine Good are what kings and priests in the Jewish Church represented; and Melchizedek as king of Salem and priest to God Most High represented them too.