insight by saying that the abilities to see red or orange are parts of the same faculty—the faculty of sight. The ability to think about math is a capacity within the thinking faculty. In general, a faculty is a compartment of the soul that contains a natural family of related capacities. We are now in a position to map out the soul in more detail. All the soul’s capacities to see are part of the faculty of sight. If my eyeballs are defective, then my soul’s faculty of sight will be inoperative,
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