The first method is by the senses-- that is to say, all that the eye, the ear, the taste, the smell, the touch perceive is understood by this method. Today this method is considered the most perfect by all the European philosophers: they say that the principal method of gaining knowledge is through the senses; they consider it supreme, although it is imperfect, for it commits errors. For example, the greatest of the senses is the power of sight. The sight sees the mirage as water, and it sees images reflected in mirrors as real and existent; large bodies which are distant appear to be small, and a whirling point appears as a circle. The sight believes the earth to be motionless and sees the sun in motion, and in many similar cases it makes mistakes. Therefore, we cannot trust it (297:2)

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