From Apocalypse Explained ~ Emanuel Swedenborg
... all the truths of the Word, which are the truths of heaven and of the church, can be seen by the understanding, in heaven spiritually, in the world rationally; for a truly human understanding is the sight itself of these truths, for it is separated from what is material, and when separated it sees truths as clearly as the eye sees objects; it sees truths as it loves them, for as it loves them it is enlightened. The angels have wisdom in consequence of seeing truths; when, therefore, it is said to any angel that this or that must be believed although it is not understood, the angel answers, Do you think that I am insane, or that you are God whom I am to believe if I do not see? It may be falsity from hell.
(Apocalypse Explained 1100d)