Whatever we know without inference is mental.

 

Whatever we know without inference is mental.
--
Human Knowledge: Its Scope and Limits (1948), p. 224

 

Bertrand Russell

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It is difficult for the matter-of-fact physicist to accept the view that the substratum of everything is of mental character. But no one can deny that mind is the first and most direct thing in our experience, and all else is remote inference — inference either intuitive or deliberate.

 

Arthur Stanley Eddington

 

If reason (I mean abstract reason, derived from inquiries a priori) be not alike mute with regard to all questions concerning cause and effect, this sentence at least it will venture to pronounce, That a mental world, or universe of ideas, requires a cause as much, as does a material world, or universe of objects; and, if similar in its arrangement, must require a similar cause. For what is there in this subject, which should occasion a different conclusion or inference? In an abstract view, they are entirely alike; and no difficulty attends the one supposition, which is not common to both of them.

 

David Hume

 

Berkeley’s argument consists of two parts. On the one hand, he argues that we do not perceive material things, but only colours, sounds, etc., and that these are “mental” or “in the mind.” His reasoning is completely cogent as to the first point, but as to the second it suffers from the absence of any definition of the word “mental.” He relics, in fact, upon the received view that everything must be either material or mental, and that nothing is both.

 

George Berkely

 

In the interior of the atom, Bohr had tried the plan of retaining the particle-electron and modifying the classical mechanics. Heisenberg took the opposite course, his procedure amounting in effect to retaining the classical mechanics, at least in form, and modifying the electron. Actually, the electron dropped out all together, because it exists only as a matter of inference and not of direct observation. For the same reason, the new theory contains no mention of atoms, nuclei, protons, or of electricity in any shape or form. The existences of all these are matters of inference, and Heisenberg's purely mathematical theory could no more make contact with them than with the efficiency of a turbine or with the price of wheat.

 

James Jeans

 

I became interested in writing this book approximately ten years ago when, having become established as a psychiatrist, I became increasingly impressed by the vague, capricious and generally unsatisfactory character of the widely used concept of mental illness and its corollaries, diagnosis, prognosis and treatment.
Although (mental illness) might have been a useful concept in the nineteenth century, today it is scientifically worthless and socially harmful.
In non-psychiatric circles mental illness all too often is considered to be whatever psychiatrists say it is. The answer to the question, Who is mentally ill? thus becomes: Those who are confined in mental hospitals or who consult psychiatrists in their private offices.

 

Thomas Szasz