2991. That natural things represent spiritual things, and that they correspond, may also be known from the fact that what is natural cannot possibly come forth except from a cause prior to itself. Its cause is from what is spiritual; and there is nothing natural which does not thence derive its cause. Natural forms are effects; nor can they appear as causes, still less as causes of causes, or beginnings; but they receive their forms according to the use in the place where they are; and yet the forms of the effects represent the things which are of the causes; and indeed these latter things represent those which are of the beginnings. Thus all natural things represent those which are of the spiritual things to which they correspond; and in fact the spiritual things also represent those which are of the celestial things from which they are.