We are no nearer to a definition of it than the Greek who rubbed a bit of amber and lifted with it a tiny straw, and from amber, Elektron called the something electricity.

Are we even as near as that to a definition of the human conscience?
The change that had come over Unorna, whether it was to be lasting or not, was profound.

The circumstances under which it took place are plain enough.

The reasons must be left to themselves--it remains only to tell the consequences which thereon followed.
The first of these was a hatred of that extraordinary power with which nature had endowed her, which brought with it a determination never again to make use of it for any evil purpose, and, if possible, never even for good.
But as though her unhappy fate were for ever fighting against her good impulses, that power of hers had exerted itself unconsciously, since her resolution had been formed.

Keyork Arabian's words, and his evident though unspoken disbelief in her denial, showed that he at least was convinced of the fact that the Wanderer was not sleeping a natural sleep.