“An organization can secure the efforts necessary to its existence, then, either by the objective inducements it provides or by changing states of mind. It seems to me improbable that any organization can exist as a practical matter which does not employ both methods in combination. In some organizations the emphasis is on the offering of objective incentives — this is true of most industrial organizations. In others the preponderance is on the state of mind — this is true of most patriotic and religious organizations.”