“Perception and knowledge could never be the same.”

— Plato , book Theaetetus

186e
Theaetetus

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Plato 80

Classical Greek philosopher -427–-347 BC

C. West Churchman (1913–2004) American philosopher and systems scientist

Cited in: John Zeisel (1984) Inquiry by design: tools for environment-behavior research. p. 3
1960s - 1970s, The Design of Inquiring Systems (1971)

“Means of knowledge are sensory perception, inference and holy scriptures.”

Madhvacharya (1199–1278) Hindu philosopher who founded Dvaita Vedanta school

Beginner’s Guide to Sri MadhvAchArya’s Life and Philosophy

“All our knowledge has its origin in our perceptions.”

Leonardo Da Vinci (1452–1519) Italian Renaissance polymath

The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.

“But since it is better to have perception or to have omnipotence, to be pitiful or to be without passions, than not to have these attributes; how hast Thou perception, if Thou art not a body? or omnipotence, if Thou canst not do everything? or how art Thou at one and the same time pitiful and without passions? For if only bodily things have perception, since the senses with which we perceive belong and attach to the body; how canst Thou have perception, since Thou art not a body but the Supreme Spirit, which is higher than a body can be? But if perception is only knowledge or a means towards knowledge; since he who perceives, has knowledge thereby, according to the special character of the senses, by sight of colours, by taste of savours and so forth: then whatsoever has knowledge in whatsoever manner may be said without impropriety in some sense to perceive. Therefore, O Lord, although Thou art not a body, yet of a truth Thou hast in this sense perception in the highest degree, since Thou knowest all things in the highest degree; but not in the sense wherein an animal that has knowledge by means of bodily feeling is said to have perception.”

Anselm of Canterbury Proslogion

Proslogion, chapter 5 by Anselm of Canterbury, translated by Clement C. J. Webb (1903).

“Was a revelation to be made known to us, it must be accommodated to our external senses, and also to our reason, so that we could come at the perception and understanding of it, the same as we do to that of things in general.”

Ethan Allen (1738–1789) American general

Source: Reason: The Only Oracle Of Man (1784), Ch. V Section II - Containing Observations on the Providence and Agency of God, as it Respects the Natural and Moral World, with Strictures on Revelation in General
Context: There has in the different parts and ages of the world, been a multiplicity of immediate and wonderful discoveries, said to have been made to godly men of old by the special illumination or supernatural inspiration of God, every of which have, in doctrine, precept and instruction, been essentially different from each other, which are consequently as repugnant to truth, as the diversity of the influence of the spirit on the multiplicity of sectaries has been represented to be.
These facts, together with the premises and inferences as already deduced, are too evident to be denied, and operate conclusively against immediate or supernatural revelation in general; nor will such revelation hold good in theory any more than in practice. Was a revelation to be made known to us, it must be accommodated to our external senses, and also to our reason, so that we could come at the perception and understanding of it, the same as we do to that of things in general. We must perceive by our senses, before we can reflect with the mind. Our sensorium is that essential medium between the divine and human mind, through which God reveals to man the knowledge of nature, and is our only door of correspondence with God or with man.