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I am unable, when I turn to myself, to recognize any of my faculties or my capacities. The inner sensation which I have of myself informs me that I am, that I think, that I will, that I have sensory awareness, that I suffer, and so on; but it provides me with no knowledge whatever of what I am — of the nature of my thought, my sensations, my passions, or my pain — or the mutual relations that obtain between all these things ... I have no idea whatever of my soul.
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Dialogues on Metaphysics (1688) Dialogue III

 

Nicolas Malebranche

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And therefore, even though animals are in pain, they aren't aware of it. They don't have this third order pain awareness. They are not aware of pain, and therefore they do not suffer as human beings do. Now, this is a tremendous comfort to those of us who are animal lovers, like myself, or to pet owners. Even though your dog or your cat may be in pain, it isn't really aware of being in pain, and therefore it doesn't suffer as you would when you are in pain.

 

William Lane Craig

 

Nature consists of the elements given by the senses. Primitive man first takes out of them certain complexes of these elements that present themselves with a certain stability and are most important to him. The first and oldest words are names for "things". ... The sensations are no "symbols of things". On the contrary the "thing" is a mental symbol for a sensation-complex of relative stability. Not the things, the bodies, but colours, sounds, pressures, times (what we usually call sensations) are the true elements of the world.

 

Ernst Mach

 

As you are aware, no perceptions obtained by the senses are merely sensations impressed on our nervous systems. A peculiar intellectual activity is required to pass from a nervous sensation to the conception of an external object, which the sensation has aroused. The sensations of our nerves of sense are mere symbols indicating certain external objects, and it is usually only after considerable practice that we acquire the power of drawing correct conclusions from our sensations respecting the corresponding objects.

 

Hermann von Helmholtz

 

Prophecy really includes ordinary knowledge; for the knowledge which we acquire by our natural faculties depends on knowledge of God and His eternal laws; but ordinary knowledge is common to all men as men, and rests on foundations which all share, whereas the multitude always strains after rarities and exceptions, and thinks little of the gifts of nature; so that, when prophecy is talked of, ordinary knowledge is not supposed to be included.
Nevertheless it has as much right as any other to be called Divine, for God's nature, in so far as we share therein, and God's laws, dictate it to us; nor does it suffer from that to which we give the preeminence, except in so far as the latter transcends its limits and cannot be accounted for by natural laws taken in themselves.

 

Baruch Spinoza

 

If each us had a different kind of sense perception — if we could only perceive things now as a bird, now as a worm, now as a plant, or if one of us saw a stimulus as red, another as blue, while a third even heard the same stimulus as a sound — then no one would speak of such a regularity of nature, rather, nature would be grasped only as a creation which is subjective in the highest degree. After all, what is a law of nature as such for us? We are not acquainted with it in itself, but only with its effects, which means in its relation to other laws of nature — which, in turn, are known to us only as sums of relations. Therefore all these relations always refer again to others and are thoroughly incomprehensible to us in their essence.

 

Friedrich Nietzsche