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All existing things upon this earth, which have knowledge of their own existence, possess, some in one degree and some in another, the power of thought, accompanied by perception, which is the awakening of thought by the effects of external objects upon the senses.
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Formal Logic (1847)

 

Augustus De Morgan

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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

 

All this care for the world, we must believe, is taken by the Gods without any act of will or labor. As bodies which possess some power produce their effects by merely existing: e.g. the sun gives light and heat by merely existing; so, and far more so, the providence of the Gods acts without effort to itself and for the good of the objects of its forethought. This solves the problems of the Epicureans, who argue that what is divine neither has trouble itself nor gives trouble to others.

 

Sallustius (or Sallust)

 

What we call thought (1) is itself an orderly thing, and (2) can only be applied to material, i.e. to perceptions or experiences, which have a certain degree of orderliness. This has two consequences. First, a physical organization, to be in close correspondence with thought (as my brain is with my thought) must be a very well-ordered organization, and that means that the events that happen within it must obey strict physical laws, at least to a very high degree of accuracy. Secondly, the physical impressions made upon that physically well-organized system by other bodies from outside, obviously correspond to the perception and experience of the corresponding thought, forming its material, as I have called it. Therefore, the physical interactions between our system and others must, as a rule, themselves possess a certain degree of physical orderliness, that is to say, they too must obey strict physical laws to a certain degree of accuracy.
PHYSICAL LAWS REST ON ATOMIC STATISTICS AND ARE THEREFORE ONLY APPROXIMATE

 

Erwin Schrodinger

 

I thought that as I had failed in the contemplation of true existence, I ought to be careful that I did not lose the eye of my soul; as people may injure their bodily eye by observing and gazing on the sun during an eclipse, unless they take the precaution of looking at the image reflected in the water, or in some similar medium. ...I was afraid that my soul might be blinded altogether if I looked at things with my eyes or tried by the help of my senses to apprehend them. And I thought that I had better had recourse to ideas, and seek in them truth in existence. I dare to say that the simile is not perfect--for I am far from admitting that he who contemplates existence through the medium of ideas, sees them only "through a glass darkly," any more than he who sees them in their working and effects.

 

Socrates

 

The Common Sense, is that which judges of things offered to it by the other senses. The ancient speculators have concluded that that part of man which constitutes his judgment is caused by a central organ to which the other five senses refer everything by means of impressibility; and to this centre they have given the name Common Sense. And they say that this Sense is situated in the centre of the head between Sensation and Memory. And this name of Common Sense is given to it solely because it is the common judge of all the other five senses i.e. Seeing, Hearing, Touch, Taste and Smell. This Common Sense is acted upon by means of Sensation which is placed as a medium between it and the senses. Sensation is acted upon by means of the images of things presented to it by the external instruments, that is to say the senses which are the medium between external things and Sensation. In the same way the senses are acted upon by objects. Surrounding things transmit their images to the senses and the senses transfer them to the Sensation. Sensation sends them to the Common Sense, and by it they are stamped upon the memory and are there more or less retained according to the importance or force of the impression.

 

Leonardo da Vinci