It is [the property] of someone of natural ability to be familiar with what is true, but to reject what is false. He who possesses this also has the capacity of properly discerning what is true. Those who easily apprehend certain things and learn [them], but are similarly disposed with regard to all forms of learning, could not be strictly called 'naturally able' on account of not having in themselves the discerning faculty, which is also strictly the first natural ability. [...] And among the things that are being proposed, whether these are forms of learning and [= or] some other [cognitive abilities], when choosing to supply and to like things that are worthy but rejecting and hating things not of such a kind, they properly do this and are good discerners.