There is a distinct difference between invocation and evocation, as Crowley explains:

To "invoke" is to "call in", just as to "evoke" is to "call forth". This is the essential difference between the two branches of Magick. In invocation, the macrocosm floods the consciousness. In evocation, the magician, having become the macrocosm, creates a microcosm. You invoke a God into the Circle. You evoke a Spirit into the Triangle.[19]
Generally, evocation is used for two main purposes: to gather information and to obtain the services or obedience of a spirit or demon. Crowley believed that the most effective form of evocation was found in the grimoire on Goetia (see below), which instructs the magician in how to safely summon forth and command 72 infernal spirits. However, it is equally possible to evoke angelic beings, gods, and other intelligences related to planets, elements, and the Zodiac.

Unlike with invocation, which involves a calling in, evocation involves a calling forth, most commonly into what is called the "triangle of art."

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