33. Everyone is capable of knowing very well that no life is possible without love of some kind, nor any type of joy whatsoever except the joy that flows out from the love. Furthermore the nature of the love determines the nature of the life and of the joy. If you took away your loves, and what amounts to the same, your desires (since these stem from love), thought would instantly perish and you would be as one dead. This I have been shown convincingly. Self-love and the love of the world present a semblance of life and of joy, but because they are absolutely contrary to true love, which is loving the Lord above all things and the neighbour as oneself, it is clear that neither of them is love but hatred. For the more anyone loves himself and the world, the more he hates his neighbour and so the Lord. Consequently true love is love to the Lord, true life is the life inherent in love from Him, and true joy is the joy of that life. The existence of more than one true love is not possible. Nor consequently is the existence of more than one true life possible which is the source of all true joy and happiness, such as angels in the heavens enjoy.

In general, trees represent the deepest and most significant intellectual concepts: the ones that come to us most directly from the Lord. This varies depending on us and our states: the people of the Most Ancient Church, who were in a state of loving the Lord, understood truth automatically and internally through what the Writings call "perception"; people in lower states (including most of us) have to work a little harder to learn it from the Word and by willing to follow the Lord. In other parts of the Bible, especially in the prophets and New Testament parables, the meaning of "tree" is broader, meaning not just a person's intellectual concepts but the whole person.

'Trees,' as in Joel 1:10-12, signify knowledges.