Answer:
"All human beings, as we meet them, are commingled out of good and evil." - Utterson
"I am the chief of sinners, I am the chief of suffering." - Jekyll
"If he be Mr. Hyde, I shall be Mr. Seek." - Utterson
"I learned to recognize the thorough and primitive duality of man" - Jekyll
"Man is not truly one, but truly two" - Jekyll
"The streets were crowded with people hurrying to and fro, but we went by them like ghosts." - Enfield
"I incline to Cain's heresy. I let my brother go to the devil in his own way." - Jekyll
"The horror of my other self surged up within me with a cyclonic fury." - Jekyll
"I had been mad enough to allow myself to be enrolled as one of the crew." - Jekyll
"It was Hyde, after all, and Hyde alone, that was guilty." - Jekyll