Penny Dreadful, Season 3

Henry Jekyll:
[after a patient regresses into insanity] Aye, that's the tragedy of it. The ceremony lasts a matter of hours, and then they revert.

Victor:
The beast will out.

Henry Jekyll:
And which is true? Which is the real man: the beast or the angel?

Victor:
We are both.

Henry Jekyll:
Are we?

Victor:
Good and evil braided be.

Henry Jekyll:
Oh, no. Not at all. Or at least, we can seem to be that way. So complicated, I mean. In the end, we must be that thing the world demands of us. We must take all the lust and the avarice and the ambition and bury them. All the alien and ugly things, all the things we really are! The other one, the other man, we cannot allow him!