Selection from Arcana Coelestia ~ Emanuel Swedenborg
The Word in the letter consists of representatives of celestial and spiritual things, which are of heaven and the church, and therefore in the internal sense these are signified. Hence the Word of the Lord may be called as it were heaven in ultimates, for in the ultimates of heaven all things which are seen and heard are representatives of such things as angels in the higher heavens are speaking and thinking, all which bear relation to the truths of faith and to the goods of love.That in the ultimates of heaven such things are representative, is because they who are in the ultimates of heaven do not apprehend the interior things of angelic wisdom, but only such things as represent them. It is also according to Divine order that when higher things fall down into lower, they are turned into such as are similar, and are thus presented before the external senses, thus accommodated to the apprehension of everyone.
From this it is that the Word in ultimates, that is, in the sense of the letter, is representative, and consequently significative, of celestial and spiritual things which are in the higher heavens, and is hereby presented in a form accommodated to the apprehension of men. In this way it is also of service to the heavens as a basis and foundation.
(from Arcana Coelestia 10126)