In spite of the lonely streets, her uneasiness had no external cause, but only an inner source.
You don't get to be a "force of nature" without having an inner source of strength to tap into.
Musicians may also work on strengthening their sense of pulse using inner sources, such as breath, and subdividing breaths.
Hence the reproduction inside the volume is incomplete - it breaks down if the listener sits between speakers and inner source.
There was cruelty in the man's face and a harshness that seemed to spring from some inner source of malice and hatred.
Music feeds itself in that inner source, deep in the heart, as the star, because there is no better elsewhere, or golden age in the past.
Toby had the swift impression that they weren't reflecting light so much as radiating it from some deep inner source.
It was warm to the touch, as if heated from an inner source.
Mamut leaned close to her, sensing the moment was right, and drawing from some inner source a power to compel.
Somehow, from some inner source of bitter strength, she pulled herself together.