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:

124. And ye shall have affliction ten days, signifies that infestation and temptation therefrom will last for some time. This is evident from the signification of "affliction," as being infestation and temptation of those who are in the spiritual affection of truth by those who are in falsities; (that this is meant by "affliction" is clear, since it is said in reference to such;) also from the signification of "ten days," as being duration for some time. Duration for some time is signified by "ten days," for the reason that the entire duration of infestation and temptation is signified by "forty days" (See Arcana Coelestia 2959, 7985, 7986), and "ten" means some part thereof; for all numbers in the Word signify things or states, with variety according to the relation to other numbers. The number "ten," without reference to other numbers, signifies what is full or much (Arcana Coelestia 3107, 4638); but in reference to a greater number, it signifies as much as is needed for uses (n. 9757); so here it signifies duration for some time, thus as use demands. (That all numbers in the Word signify things or states, see Arcana Coelestia 482, 487, 647, 755, 813, 1963, 1988, 2075, 2252, 3252, 4264, 4495, 4670, 5265, 6175, 9488, 9659, 10217, 10253.) He that considers, can see that by the "affliction of ten days" here, which they are to have who are cast into prison by the devil, something else must be meant than ten days' affliction.