Think of our bodies as a material that our spirits use to explore earthly sensations. Our spirits in fact do not need a body but use one when they desire or feel the need to touch, see, hear, or be alone.
Think of our spirits as being liken to mist. Solid and in Flux, Opaque yet Translucent. Dry and then again Moist.
Now with this in mind picture a field on a spring morning, the sun just about to rise. See the swirling mist's that run this way and that in the light breeze. Think of the whole world as being like this field.
Cup your hand into the mist and pull out a small ball of it and release it into a part of the air that is clear. Now you have a single part of the mist that once was part of the whole.

Our spirits when not in an earthly body are like the mist that surrounds the world but when we enter flesh we are like the single ball of mist, alone, independent and yet still part of the whole. In this we all come from one place and all return there when our bodies expire.
When we return to the whole we become one with each other (although retaining our identity) and experiences and knowledge are shared.
Because we are all as one we all have the ability to communicate through our spirits with each other. Some are better than others while the majority that are within bodies do not believe and therefor can not achieve this.

Examples of this could be :-
Mediums who contact the dead are really contacting the whole.
Ghosts may be spirits who refuse rejoin the whole and are therefor trapped in the appearance of their last body.
Psychics can contact the whole or other "living" embodiments of spirits.
Palmists and Fortune Tellers who are seeing the lives of the spirit not the body.

An author once wrote that Gods only exist when people need them. In the ever-changing world the needs of the living change too. Perhaps it can be said that when a large amount of people cry out to or pray to or worship a certain thing then that thing becomes real to them. Surly all those spirits concentrating together can accomplish miracles ?
In different countries alternate religions and Gods appear but when studied from many angles they all appear as one. Take for example the fact that in all major religions (not just modern but ancient) in the world there has been a great flood.
Are we indeed masters of our own destiny?

NINJA no KOKORO with text by Masaaki Hatsumi