57. 'The plant yielding seed' is every truth that looks towards a use. 'The tree in which there is fruit' is the good that accompanies faith. 'Fruit' is what the Lord gives to the celestial man, while 'seed', the source of the fruit, is what He gives to the spiritual man. This is why it is said that 'the tree producing seed will be for you for food'. That celestial food is called 'fruit from a tree' is clear from the next chapter where the subject is the celestial man. Here let just that be mentioned which the Lord spoke through Ezekiel,

Beside the river there is rising up upon its bank, on this side and on that, every tree for food. Its leaf will not fall nor its fruit fail. It is re-born monthly, for its waters flow out from the Sanctuary, and its fruit will be for food, and its leaf for medicine. Ezekiel 47:12.

'Waters from the Sanctuary' means the life and mercy of the Lord, who is the Sanctuary; 'fruit' means wisdom, which is food for them; 'leaf' is intelligence, which is given them for a use, which is called 'medicine'. Spiritual food however is called 'a plant', as stated through David,

[Jehovah is] my Shepherd, I shall not want; He makes me ¹ lie down in green pastures. ² Psalms 23:1-2.

Footnotes:

Used several times in the Bible, the phrase “both small and great” (or “both the small and the great”) represents various levels or degrees of involvement in a spiritual state. For instance, when the angels strike men with blindness, “both small and great,” in Genesis 19:11, it means removing all concepts of truth, both general ideas and specifics based on those ideas. When reward is promised to “those who fear Your name, small and great” in Revelation 11:18, it means people who love things having to do with the Lord in a lesser degree and in a greater degree.

(References: Apocalypse Revealed 527, 604, 810, 832; Arcana Coelestia 2384; The Apocalypse Explained 514 [11])