I need help with Dr. Jekyll and Mr. Hyde! PLEASE!?

Dr.Jekyll is the epitome of the fine,upstanding,cultured English gentleman of the nineteenth century with very high moral standards whereas Mr Hyde is exactly the opposite.Now here is the irony

they speak and use the same words and sentences but with a different emphasis.The words coming from Dr.Jekyll sound good but the same words coming from Hyde are full of menace.There is another point to this the story teller is warning you about drug abuse as Dr.Jekyll is experimenting.The good personality tries injecting compounds and turns himself into a fiend.

Jekyll would never do the things Hyde does, yet the message is that Hyde is really a part of him that cannot be expressed in Victorian England by a gentleman.