[151] and any one may conjecture this from the common changes which take place in its essential organs; for when grief exists in the soul of man, the eyes are full of concern and melancholy; and on the other hand, when joy is in our heart the eyes smile and rejoice; and when fear gets the upper hand they are full of turbulent and disorderly confusion, and are subject to all kinds of irregular motions, and quiverings, and distortions.