"We must put ourselves in the position of the subject who tries to find his way in this world, and we must remember, first of all, that the environment by which he is influenced and to which he adapts himself is his world, not the objective world of science — is nature and society as he sees them. The individual subject reacts only to his experience, and his experience is not everything that an absolutely objective observer might find in the portion of the world within the individual's reach, but only what the individual himself finds."
W.I. Thomas and F. Znaniecki, 1918-20/1927:1846-7