“The ability to create or recreate images in the mind's eye and retain them can be classed as one of the most important, if not the most important areas of the magical art. Without it, the practice of magic is nearly impossible, though even with a small ability to "see", a fair amount can be attempted.”
by Dolores Ashcroft-Nowicki and J H Brennan
 Magical Use of Thought Forms: A Proven System of Mental & Spiritual Empowerment