The Inner Life, v. I/Fifth Section/VII
THE FOCUS OF CONSCIOUSNESS
The consciousness in man can only be focussed in one vehicle at a time, though he may be simultaneously conscious through the others in a vaguer way. If you will hold up a finger in front of your face you will find that you can so focus your eyes as to see the finger perfectly. At the same time you will see the wall and furniture behind the finger, but not perfectly, because they are out of focus. In a moment you can change the focus of your eyes so that you will see the wall and the furniture perfectly; in that case you will still see the finger, but will see it only dimly, because it in turn is now out of focus.
Precisely in the same way if a man who has developed astral and mental consciousness focusses himself in the physical brain as in ordinary life, he will see perfectly the physical bodies of his friends, and will at the same time see their astral and mental bodies, but only somewhat dimly. In far less than a moment he can change that focus so that he will see the astral quite fully and perfectly. In that case he will still see the mental and physical bodies, but not in full detail. The same thing is true of the mental sight and of the sight of higher planes.
You ask how it is possible for an entity functioning on the astral plane to be aware of a physical accident or to hear a physical cry. It would not be the physical cry that he would hear; physical sounds assuredly produce an effect upon the astral plane, though I do not think that we should be quite correct in calling that result sound. Any cry which had in it strong feeling or emotion would produce a strong effect upon the astral plane, and would convey exactly the same idea there as here. In the case of an accident the rush of emotion caused by the pain or the fright would flame out like a great light, and could not fail to attract the attention of a seer if he were anywhere near. A case in which this very thing occurred is related in Invisible Helpers — a case in which a boy fell over a cliff; and was supported and comforted by Cyril until physical help could be brought.