Man" is a tricky word to discuss, because the Hebrew of the Old Testament uses six different words that are generally translated as "man," with shades of meaning that are difficult to express in English. Swedenborg, meanwhile, uses two different words in the original Latin: "vir," which is a singular male person, and "homo," which usually has a meaning akin to "mankind" or "humanity" -- but is sometimes used for a singular male person as well. When used in the sense of "human" or "mankind," the meaning of "man" is based on the fact that the Lord is the perfect, divine human, and is in a way the archetype for our humanity. The Lord is, in His essence, love itself -- perfect, infinite, divine love, which is the source of all life. So in the ultimate sense, "man" represents the Lord's love and goodness. In less exalted uses, it represents the love and goodness that exists in churches, societies, and individual people. That's because the love we have, as individuals and collectively, is a reflection of the Lord's love, and our humanity is a reflection of the Lord's humanity.

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.