Man is formed of vibrations & lives in them

The Life Absolute from which has sprung all that is felt, seen, and perceived, and into which all again merges in time, is a silent, motionless and eternal life which among the Sufis is called Zat. Every motion that springs forth from this silent life is a vibration and a creator of vibrations. Within one vibration are created many vibrations; as motion causes motion so the silent life becomes active in a certain part, and creates every moment more and more activity, losing thereby the peace of the original silent life. It is the grade of activity of these vibrations that accounts for the various planes of existence.
These planes are imagined to differ from one another, but in reality they cannot be entirely detached and made separate from one another. The activity of vibrations makes them grosser, and thus the earth is born of the heavens. The mineral, vegetable, animal and human kingdoms are the gradual changes of vibrations, and the vibrations of each plane differ from one another in their weight, breadth, length, color, effect, sound and rhythm.

Man is not only formed of vibrations, but he lives and moves in them; they surround him as the fish is surrounded by water, and he contains them within him as the tank contains water. His different moods, inclinations, affairs, successes and failures, and all conditions of life depend upon a certain activity of vibrations, whether these be thoughts, emotions or feelings. It is the direction of the activity of vibrations that accounts for the variety of things and beings.
This vibratory activity is the basis of sensation and the source of all pleasure and pain; its cessation is the opposite of sensation. All sensations are caused by a certain grade of activity of vibration. There are two aspects of vibrations, fine and gross, both containing varied degrees; some are perceived by the soul, some by the mind, and some by the eyes.
What the soul perceives are the vibrations of the feelings; what the mind conceives are the vibrations of the thoughts; what the eyes see are the vibrations solidified from their ethereal state and turned into atoms which appear in the physical world, constituting the elements ether, air, fire, water and earth. The finest vibrations are imperceptible even to the soul. The soul itself is formed of these vibrations; it is their activity which makes it conscious.

Creation begins with the activity of consciousness, which may be called vibration, and every vibration starting from its original source is the same, differing only in its tone and rhythm caused by a greater or lesser degree of force behind it. On the plane of sound, vibration causes diversity of tone, and in the world of atoms, diversity of color.
It is by massing together that the vibrations become audible, but at each step towards the surface they multiply. Sound gives to the consciousness evidence of its existence.

Excerpted from The Mysticism of Sound

Hazrat Inayat Khan