Bahá’í World Faith, page 149 by ‘Abdu’l-Bahá
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der how these diverse parts and members of the human body are closely connected and harmoniously united one with the other. Every part is the essential requisite of all other parts and has a function by itself. It is the mind that is the all-unifying agency that so uniteth all the component parts one with the other that each dischargeth its specific function in perfect order, and thereby cooperation and reaction are made possible. All parts function under certain laws that are essential to existence. Should that all-unifying agency that directeth all these parts be harmed in any way there is no doubt that the constituent parts and members will cease functioning properly; and though that all-unifying agency in the temple of man be not sensed or seen and the reality thereof be unknown, yet by its effects it manifesteth itself with the greatest power.
Thus it hath been proven and made evident that these infinite beings in this wondrous universe will discharge their functions properly only when directed and controlled by that Universal Reality, so that order may be established in the world. For example, interaction and cooperation between the constituent parts of the human body are evident and indisputable, yet this does not suffice; an all-unifying agency is necessary that shall direct and control the component parts, so that these through interaction and cooperation may discharge in perfect order their necessary and respective functions.
You are well aware, praised be the Lord, that both interaction and cooperation are evident and proven amongst all beings, whether large or small. In the case of large bodies interaction is as manifest as the sun, whilst in the case of small bodies, though interaction be unknown, yet the part is an indication of the whole. All these interactions therefore are connected with that all-embracing power which is their pivot, their center, their source and their motive power.
For instance, as we have observed, cooperation among the constituent parts of the human body