Austrian physicist and philosopher (1838 – 1916).
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.
I know of nothing more terrible than the poor creatures who have learned too much. Instead of the sound powerful judgement which would probably have grown up if they had learned nothing, their thoughts creep timidly and hypnotically after words, principles and formulae, constantly by the same paths. What they have acquired is a spider’s web of thoughts too weak to furnish sure supports, but complicated enough to provide confusion.
Not bodies produce sensations, but element-complexes (sensation-complexes) constitute the bodies. When the physicist considers the bodies as the permanent reality, the `elements’ as the transient appearance, he does not realise that all `bodies’ are only mental symbols for element-complexes (sensation-complexes)