Meanings of central depths in English

If the central depths were untouched, hardly a pin-point of surface remained the same.

Our excited political controversies, our playing at militarism, have tended to bring men's thoughts from central depths to surfaces.

Your nature runs to social communions, to visible movements, to outwardness, in short, more than to the central depths within.

And what eyes they were!-clearyet unfathomable, bubbling with inexhaustible laughter, yet drawing their freshness and sparkle from the central depths of thought!