Some Ans. Questions 2014 by -'Abdu'l-Bahá- 1 Para

It was already mentioned that the parts and members of the human body mutually influence one another. For instance, the eye sees and the heart is affected. The ear hears and the spirit is influenced. The heart finds peace, the thoughts expand, and all the members of the body experience a state of well-being. What a connection and relationship this is! And if such relationships, such spiritual influences and effects, are found among the various members of the body of man, which is only one particular being among many, then there must assuredly exist both spiritual and material relationships among the countless universal beings. And although our present methods and sciences cannot detect these relationships among the universal beings, their existence is nonetheless clear and indisputable (69:5)

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