329. We can tell what a useful function is from the goal of the creation of the universe. The goal of the creation of the universe is to bring about an angelic heaven; and since an angelic heaven is the goal, so is humanity or the human race, since that is where heaven comes from. It follows, then, that everything that has been created is an intermediate goal, and that the functions are useful in the sequence, on the level, and in the specific way that they relate to humanity, and through humanity to the Lord.
Divine Love and Wisdom #301
301. It is furthermore clearly apparent from angelic ideas, which are independent of space, that nothing in the created universe has life except the human God alone, or the Lord, that nothing moves except as the result of life from Him, and that nothing has existence except through the sun from Him - consequently that it is a truth that in God we live, move, and have our being. 1
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