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.

123. Since the Lord does appear in heaven as a sun because of the divine love that is in him and from him, all the people there constantly turn toward him. The inhabitants of the heavenly kingdom turn toward him as the sun, while the inhabitants of the spiritual kingdom turn toward him as the moon. In contrast, the inhabitants of hell turn toward the darkness and dimness that are on the opposite side, and therefore turn away from the Lord. This is because all the people who are in the hells are caught up in love for themselves and the world and are therefore opposed to the Lord. The ones who turn toward the darkness that stands for our world's sun are at the back of the hells and are called "demons," while the ones who turn toward the dimness that stands for our moon are in the front of hell and are called "spirits." This is why people in the hells are described as being in darkness and people in the heavens as being in light. "Darkness" means falsity arising from evil, and "light" means truth arising from good.

The reason people turn in this way is that in the other life we all look toward what rules in our deeper natures - toward our own loves, then; and these deeper natures form the faces of angels and spirits. Further, in a spiritual world the cardinal points are not fixed the way they are in a natural world. Instead, they are determined by the way people face.

We ourselves, in spirit, are also turning in the same fashion - away from the Lord if we are caught up in self-love and love of the world, and toward him if we are in a love for him and for our neighbor. We are unaware of this, though, because we are in a natural world where the cardinal points are determined by the sun's rising and setting. Since it is hard for people to grasp this, examples will be given below where we deal with the cardinal points and with space and time in heaven.