These words are taken from Italian Witchcraft by Raven Grimassi:
The Astral World, through the Plane of Forces, receives the thoughts and vibrations of actions from the Physical World. Just as solid materials are used to create objects in our world Thoughts and vibrations create etheric object on the Astral Plane.
Therefore, what people strongly believe in enough can be created astrally. This is one method by which ritual Magick is performed. Energy is first raised with a specific purpose in mind, then it it given up to the Plane of Forces, where it it drawn and channeled to the Astral Work, and so obtains a thought form.
The true purpose of the Astral Plan is to prepare us for future lives and existences by burning out (purifying) or exhausting, all of our fears, desires and false concepts. These bind us to the lower worlds. So it is our afterlife experiences in the lower astral world which transforms us.
The Astral World is under the Divine Law of Cause and Effect, action and reaction. It is the essence of the Three-fold Law.
The Astral Planes contain all the heavens and hells which followers of all religions believe in. They will experience what they believe awaits them.
On the Astral Plane, thoughts are things. As you believe so shall it be.