“Anyone who wants to know the human psyche will learn next to nothing from experimental psychology. He would be better advised to put away his scholar’s gown, bid farewell to his study, and wander with human heart through the world. There, in the horrors of prisons, lunatic asylums and hospitals, in drab suburban pubs, in brothels and gambling-hells, in the salons of the elegant, the Stock Exchanges, Socialist meetings, churches, revivalist gatherings and ecstatic sects, through love and hate, through the experience of passion in every form in his own body, he would reap richer stores of knowledge than textbooks a foot thick could give him, and he will know how to doctor the sick with real knowledge of the human soul.”