vi THE ANATOMY OF HUMAN PERSONALITY 233
The psychology expounded in these pages attempts to combine in one system what is important in all the principles and methods of all the different schools of psychology. The normal adult man, being the organism in which the nature of mental activity is most fully revealed, will be the centre of our interest.
It was Heraclitus who said, ' Thou canst not find the frontiers of the soul, though thou shouldest travel every path, so deep a ground it hath \ But it is strange to say that much of our new knowledge of the soul has come to us through our understanding of the soul's conflicts and diseases.
The new synthesis of mind and body which had arisen from both psychological treatment and physiological research, has broken down the dualism of mind and body. This is the outstanding achievement of twentieth-century medicine and will greatly influence its future. We are now returning to the point of view held in 500 B.C. that * health depends on harmony, and disease upon the discord within the body \
The conclusions of modern psychology cannot be put aside if a deep understanding of the nature of man is to be secured. Hocking" (p. 16) describes psychology as the ' official ^portrait-painter of the human self \ There is a marked difference between a photograph and a portrait. The camera impartially surveys everything it sees. It helps little to understand the character of the subject. The painter depicts only those features that give distinctive expression to the personality of the sitter. A portrait is always a more intimate creation than a photograph.
Contemporary psychological schools have taken three principal roads in seeking the centre of gravity of personality, gradually advancing from the surface of consciousness to the inmost depths of the mind. Be-