Big Toenail

And each one of these members hath its own special function. The mind force -- whether we call it pre-existent or contingent -- doth direct and co-ordinate all the members of the human body, seeing to it that each part or member duly performeth its own special function. If, however, there be some interruption in the power of the mind, all the members will fail to carry out their essential functions, deficiencies will appear in the body and the functioning of its members, and the power will prove ineffective.

‘Abdu’l-Bahá, Selections from the Writings of ‘Abdu’l-Bahá, p. 48

Consider how numerous are these parts and members, but the oneness of the animating spirit of life unites them all in perfect combination. It establishes such a unity in the bodily organism that if any part is subjected to injury or becomes diseased, all the other parts and functions sympathetically respond and suffer, owing to the perfect oneness existing.

‘Abdu’l-Bahá, The Promulgation of Universal Peace, p. 320

In the same way consider the body of man. It must be composed of different organs, parts and members. Human beauty and perfection require the existence of the ear, the eye, the brain and even that of the nails and hair; if man were all brain, eyes or ears, it would be equivalent to imperfection. So the absence of hair, eyelashes, teeth and nails would be an absolute defect, though in comparison with the eye they are without feeling, and in this resemble the mineral and plant; but their absence in the body of man is necessarily faulty and displeasing.

‘Abdu’l-Bahá, Some Answered Questions, p. 129

It is obvious that all created things are connected one to another by a linkage complete and perfect, even, for example, as are the members of the human body. Note how all the members and component parts of the human body are connected one to another. In the same way, all the members of this endless universe are linked one to another. The foot and the step, for example, are connected to the ear and the eye; the eye must look ahead before the step is taken. The ear must hear before the eye will carefully observe. And whatever member of the human body is deficient, produceth a deficiency in the other members. The brain is connected with the heart and stomach, the lungs are connected with all the members. So is it with the other members of the body.

‘Abdu’l-Bahá, Selections from the Writings of ‘Abdu’l-Bahá, p. 47

It means, in brief, to regard humanity as a single individual, and one's own self as a member of that corporeal form, and to know of a certainty that if pain or injury afflicts any member of that body, it must inevitably result in suffering for all the rest.

‘Abdu’l-Bahá, The Secret of Divine Civilization, p. 39

"Regard the world as the human body," wrote Bahá’u’lláh to Queen Victoria. We can surely regard the Bahá’í world, the army of God, in the same way. In the human body, every cell, every organ, every nerve has its part to play. When all do so the body is healthy, vigorous, radiant, ready for every call made upon it. No cell, however humble, lives apart from the body, whether in serving it or receiving from it. This is true of the body of mankind in which God "hast endowed each and all with talents and faculties," and is supremely true of the body of the Bahá’í World Community, for this body is already an organism, united in its aspirations, unified in its methods, seeking assistance and confirmation from the same Source, and illumined with the conscious knowledge of its unity. Therefore, in this organic, divinely guided, blessed and illumined body the participation of every believer is of the utmost importance, and is a source of power and vitality as yet unknown to us. For extensive and deep as has been the sharing in the glorious work of the Cause, who would claim that every single believer has succeeded in finding his or her fullest satisfaction in the life of the Cause? The Bahá’í World Community, growing like a healthy new body, develops new cells, new organs, new functions and powers as it presses on to its maturity, when every soul, living for the Cause of God, will receive from that Cause, health, assurance and the overflowing bounties of Bahá’u’lláh which are diffused through His divinely ordained order.

The Universal House of Justice, Messages 1963 to 1986, p. 42-43