2.  Invocation and Evocation are often, mistakenly, used interchangeably and with little appreciation of their vast difference. Invocation precisely means to actually bring a spirit or divine presence into the psyche and even the body of the magician.

Evocation, in contrast, calls a spirit or other entity into the presence, not the being, of the magician and usually into a magical triangle placed outside the magic circle of the magician.

Invocation requires psychological and spiritual strength as well as proper preparation. It’s not just that there are dangers but that the opportunities are so great.