'A palace,' as in Psalm 144:12, represents the understanding in which truths have a beautiful form. They have a beautiful form when they are from affection for truth. 'A palace,' as in Amos 4:3, signifies the Word, and consequently, the truth of doctrine which is from good. 'A palace,' as in Isaiah 32:14, signifies the whole church regarding truths from good.

(Odkazy: Apocalypse Explained 721)

4780. 'And mourned over his son many days' means a state, namely one of mourning for lost good and truth. This is clear from the representation of Joseph, to whom 'son' refers here, as Divine Truth, specifically the truths spoken of above in 4776; and from the meaning of 'days' as states, dealt with in 23, 487, 488, 493, 893, 2788, 3785, in this case a state of great mourning since the expression 'many days' is used.