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:

Morning comes with the rising of the sun, and the sun -- which gives life to the earth with its warmth and light -- represents the Lord in His divinity, bringing spiritual life through love and wisdom. Thus, the morning represents the coming of the Lord into our lives, and all the things that flow from it: the love, joy and enlightenment He brings; the peace and tranquility of passing the spiritual obscurity of night; the anticipation of the learning and usefulness of a new day; and the awareness of The Lord's renewed presence.

(References: Apocalypse Explained 179; Apocalypse Revealed 151; Arcana Coelestia 2333 [1-3], 2540, 2780, 5740, 8211, 8812, 10134, 10200, 10413; True Christian Religion 764 [1-2])