The Preface.

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...as by many more experiments of the senses it may be demonstrated) it is so much the more real. Conversely, the further it moves away from sensory experience, the more it consists of empty speculation and mere imagination. However, the more divine revelation can be brought into the realm of human understanding and the evidence of experience, the more strength it gains.

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I said further that the preceding levels The "degrees" or levels of knowledge: Sense, Reason, and Revelation. were corrected by the subsequent ones, and that is indeed the case. For where the senses fail or make mistakes, they are supported and corrected by reason; and reason is corrected by revelation. For example, when the senses judge the Moon to be larger than Saturn, or an oar to appear broken under the water A classic philosophical example of "refraction," where light bending in water tricks the eyes., etc., reason corrects this by using certain evidence from experience. Similarly, when reason has falsely concluded anything regarding invisible things, it is corrected by divine revelation. Yet that correction original: "emendation"—