John Locke proposed the fundamental principle of empiricism, all of our knowledge and ideas arise from experience. Locke was a British philosopher who pioneered ideas such as the empiricism which now define some leading ideals of psychology and philosophy. Against the claims of other well known philosophers, Locke insisted that neither the speculative principles of logic and metaphysics nor the practical principles of morality are inscribed on our minds from birth. Such propositions do not in fact have the universal consent of all human beings, Locke argued, since children and the mentally defective do not assent to them. Moreover, even if everyone did accept these principles, their universality could be better explained in terms of
