The Sun of the spiritual world and its essence, also its heat and light and the presence thereby of the Lord, have been treated of. Now also the quarters in the spiritual world will be treated of. That Sun and that world are treated of because God, and love and wisdom are dealt with. And to treat of these matters except from their very origin would be to treat from effects and not from causes. And yet effects teach nothing except effects, and when these alone are considered they reveal no cause. But causes reveal effects, and to know effects from causes is to be wise, whereas to search for causes from effects is not to be wise, because then fallacies which the investigator calls causes, present themselves, and this is to make foolishness of wisdom. For causes are prior things and effects posterior things, and prior things cannot be seen from posterior things, but posterior things can be seen from prior things. This is order. This is the reason the spiritual world is here treated of first, for all causes are there. Afterwards the natural world is treated of where all things that appear are effects.