The longing to know ourselves and to know our fellow man has been expressed in the Delphic motto “Know thyself.” It is the mainspring of all psychology. But inasmuch as the desire is to know all of man, his innermost secret, the desire can never be fulfilled in knowledge of the ordinary kind, in knowledge only by thought. Even if we knew a thousand times more of ourselves, we would never reach bottom. We would still remain an enigma to ourselves, as our fellow man would remain an enigma to us. The only way of full knowledge lies in the act of love: this act transcends thought, it transcends
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