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Chapter 2 - Sutra 11-22
Is there only one or more? Just as the form of the sun and similar luminaries is known, but not their touch, taste, smell, etc., in the same way, even though the touchable air is known to be unaffected by matter, the taste, smell, etc., are not known.
Now—each physical substance has all the above attributes of touch, etc. expressed in particular modes; however, if a mode is pronounced, it becomes perceptible by the senses. In some things, all five attributes are distinctly expressed through touch, etc., while in others, only one is. The remaining modes remain in a subtle state and cannot be known through the senses, although they certainly exist. The acuity of the senses—perceptive ability—is not the same for all types of living beings. Even among the same species, the acuity of the senses appears in various forms. Thus, the pronouncement of the attributes of touch, etc., depends on the variations in the acuity of the senses.
In addition to the five senses mentioned above, there is another sense called the mind. The mind is the instrument of knowledge. However, unlike touch and the others, it is not an external instrument; therefore, it is also called the inner organ (antahkarana). The topics of the mind are not limited like the external senses; the act of perception only captures material substances and even that in an abstract form. The mind perceives both concrete and abstract materials along with their various forms. The function of the mind is to think. It can contemplate on issues based on the capacity for development related to subjects perceived and not perceived through the senses. This thought is the same as scripture. Thus...