The Book of the Law, 1:57 says:
"All these old letters of my Book are aright; but Tzaddi is not the Star. This also is secret: my prophet shall reveal it to the wise."
Crowley, in his new comment to the Book of the Law, says the following:
"Tzaddi is the letter of The Emperor, the Trump IV, and He is the Star, the Trump XVII. Aquarius and Aries are therefore counterchanged, revolving on the pivot of Pisces, just as, in the Trumps VIII and XI, Leo and Libra do about Virgo. This last revelation makes our Tarot attributions sublimely, perfectly, flawlessly symmetrical.
The fact of its so doing is a most convincing proof of the superhuman Wisdom of the author of this Book to those who have laboured for years, in vain, to elucidate the problems of the Tarot."
He puts forward the idea that it's the correct ordering and correct attributions of the Tarot trumps that provides a "most convincing proof of the superhuman Wisdom of the author of this Book." So it's easy to see from this that correspondences play a very major role in occultism. They have almost a sacred quality.