This is by way of preface to what follows, so that the discussion there can readily be understood; the point being to demonstrate that the earthly meaning of the Word, which is its literal meaning, is the foundation, container, and support of its spiritual and heavenly meanings.
It was noted in §§6 and 19 above that there are three levels of meaning in the Word and that the heavenly meaning is its first level, the spiritual meaning its intermediate level, and the earthly meaning its last level. This enables anyone who thinks rationally to conclude that the first level of the Word, the heavenly, works through its intermediate, which is the spiritual, to the last level, which is the earthly. We can also conclude that the last level is therefore a foundation. We can conclude further that the first level (the heavenly) is within the intermediate level (the spiritual), and through this in the last level (the earthly), which means that the last level (the earthly), which is the literal meaning of the Word, is a container; and since it is a container and a foundation, it is also a support.
However, there is no way to explain briefly how this happens. These are mysteries familiar to heaven’s angels that will be unfolded—as far as possible—in the treatises listed in the preface to Teachings on the Lord: Angelic Wisdom about Divine Providence; Angelic Wisdom about Omnipotence, Omnipresence, and Omniscience; Angelic Wisdom about Divine Love and Wisdom; and Angelic Wisdom about Life.
The Word is essentially a divine work for the salvation of the human race. For present purposes, it will suffice to conclude from what has been said above that the Word’s last level of meaning (which is earthly and is called “the literal meaning”) is a foundation, container, and support for its two deeper levels of meaning.
from Sacred Scripture White Horse, Sections 30-32