The physical body is a wonderful laboratory within which many mysterious chemical processes provide the basis of of our perception in the physical world. The consciousness — which is not physical — uses the body while it interacts with physicality.
Those who engage in spiritual pursuits seek to utilize the consciousness and perceive other dimensions. However, sadly, because people are so hypnotized by physical matter, people assume they must use physical matter and energy to activate or stimulate the consciousness. This is a fallacy, and is the basis of many problems in the world.
The fact is that the consciousness is not physical and does not require any physical influences — in fact, it is because of physical influences that the consciousness cannot perceive what it does when it is in its natural state. Our consciousness is in an abnormal state, hypnotized by sensations and physicality. When you liberate it from that state, it easily perceives other dimensions, without the need for any physical influence. On the other hand, if you deepen your reliance on physical chemicals, matter, energy, you only deepen your slavery to physicality. How then will you awaken when you are dead and your physical body is removed from the consciousness? You will not have those chemicals or substances available, thus you will remain asleep.
Therefore, in this tradition, we emphasize the development of consciousness in its natural state, free of any reliance on matter or energy. We learn instead to liberate the consciousness from matter and energy, so that it is then free to perceive without any limitations or artificial influences. Most amazing of all is this is easy, requires nothing outside of you, is free, and has no side effects.
Stated simply, if you want to activate the consciousness and perceive visions, other dimensions, etc., then learn to meditate. That is all you need. From that training, you will be able to see out of the body, and leave the body when you want, thereby using the consciousness free of any physical limitation or influence.
“Nothing is easier than self-deceit. For what each man wishes, that he also believes.” —Demosthenes
"Do not worry; cultivate the habit of being happy." —Samael Aun Weor