Philosophy of mind
Dualism is a set of views about the relationship between mind and matter (or body). It begins with the claim that mental phenomena are, in some respects, non-physical. One of the earliest known formulations of mind–body dualism was expressed in the eastern Sankhya and Yoga schools of Hindu philosophy (c. 650 BCE), which divided the world into purusha (mind/spirit) and prakriti (material substance). Specifically, the Yoga Sutra of Patanjali presents an analytical approach to the nature of the mind.
Quietism (philosophy)
Contemporary discussion of quietism can be traced back to Ludwig Wittgenstein, whose work greatly influenced the Ordinary Language philosophers. One of the early 'ordinary language' works, Gilbert Ryle's "The Concept of Mind", attempted to demonstrate that dualism arises from a failure to appreciate that mental vocabulary and physical vocabulary are simply different ways of describing one and the same thing, namely human behaviour. J. L. Austin's "Sense and Sensibilia" took a similar approach to the problems of skepticism and the reliability of sense perception, arguing that they arise only by misconstruing ordinary language, not because there is anything genuinely wrong with empirical evidence. Norman Malcolm, a friend of Wittgenstein's, took a quietist approach to skeptical problems in the philosophy of mind. More recently, the philosophers John McDowell and Richard Rorty have taken explicitly quietist positions.