My son stumbled on this after our conversation about it. It states that the signs, symbols and seals are not intrinsically magical, or ordained by heaven, such that they are a recipe for invoking divine action, but rather objects in which to assist faith.
“Now you must know that angelical spirits seeing they are of a pure intellect, and altogether incorporeal, are not marked with any marks or characters, and pingible figures, or any other human signs; but we not knowing their essence, or quality, do from their names, or works, or otherwise, according to our fancies devote and consecrate to them figures, and marks, by which we cannot any way compel them to us, but by which we rise up to them; as not to be known by such characters, and figures.
“And first of all we do set our senses both inward and outward, upon them; then by a certain admiration of our reason we are induced to a religious veneration of them, and then are wrapt with our whole mind into an ecstatical adoration. and then with a wonderful belief, an undoubted hope, quickening love, we calling upon them in spirit, and truth, by true names and characters do obtain from them that virtue, or power which we desire.”
The Three Books of Occult Philosohy, Book III, chapter XXX, pg 562
Breathings 