Now concerning nature, it is but the essential properties and the necessary relations inherent in the realities of things. And though these infinite realities are diverse in their character yet they are in the utmost harmony and closely connected together. As one's vision is broadened and the matter observed carefully, it will be made certain that every reality is but an essential requisite of other realities. Thus to connect and harmonize these diverse and infinite realities an all-unifying Power is necessary, that every part of existent being may in perfect order discharge its own function. Consider the body of man, and let the part be an indication of the whole. Consider 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 (2:24)

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 (2:25)

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 centre, their source and their motive power (2:26)

For instance, as we have observed, cooperation among the constituent parts of the human body is clearly established, and these parts and members render services unto all the component parts of the body. For instance, the hand, the foot, the eye, the ear, the mind, the imagination all help the various parts and members of the human body, but all these interactions are linked by an unseen, all-embracing power, that causeth these interactions to be produced with perfect regularity. This is the inner faculty of man, that is his spirit and his mind, both of which are invisible (2:27)

In like manner consider machinery and work-shops and the interaction existing among the various component parts and sections, and how connected they are one with the other. All these relations and interactions, however, are connected with a central power which is their motive force, their pivot and their source. This central power is either the power of steam or the skill of the master-mind (2:28)

It hath therefore been made evident and proved that interaction, cooperation and interrelation amongst beings are under the direction and will of a motive Power which is the origin, the motive force and the pivot of all interactions in the universe (2:29)

Likewise every arrangement and formation that is not perfect in its order we designate as accidental, and that which is orderly, regular, perfect in its relations and every part of which is in its proper place and is the essential requisite of the other constituent parts, this we call a composition formed through will and knowledge. There is no doubt that these infinite beings and the association of these diverse elements arranged in countless forms must have proceeded from a Reality that could in no wise be bereft of will or understanding. This is clear and proven to the mind and no one can deny it. It is not meant, however, that that Universal Reality or the attributes thereof have been comprehended. Neither its Essence nor its true attributes hath any one comprehended. We maintain, however, that these infinite beings, these necessary relations, this perfect arrangement must of necessity have proceeded from a source that is not bereft of will and understanding, and this infinite composition cast into infinite forms must have been caused by an all-embracing Wisdom. This none can dispute save he that is obstinate and stubborn, and denieth the clear and unmistakable evidence, and becometh the object of the blessed Verse: 'They are deaf, they are dumb, they are blind and shall return no more' (2:30)

End of Quote

Letter to Dr. Forel
'Abdu'l-Baha