The Limits : Microcosm; Macrocosm : The one arm of the spiral forever reaching the innermost while the other concurrently approaches the outermost.
As for a quote:
Ships that pass in the night, and speak each other in passing, only a signal shown, and a distant voice in the darkness; So on the ocean of life, we pass and speak one another, only a look and a voice, then darkness again and a silence.
Henry Wadsworth Longfellow