One and One is Two.

Light : Right, let's start talking.
Dark : (Bored) Just get this over with quickly.
Light : Don't you ever think that this might do us good?
Dark : Do you?
Light : ... We have to confront each other at times, whether or not we want to.
Dark : Keep talking.
Light : (Near exasperation) Sometimes I wish you never existed.
Dark : I'm not as stupid as you. (Light appears affronted) Whenever there's me, there's bound to be you. Without you, there's no way left to express me.
Light : True. Heights are nothing if not for the depths they towered over. Yet sometimes, why are the depths preferred?
Dark : Maybe its because the heights are already so full, people were pushed off to the depths all the time. Therefore they'd chose to stay in the depths, for that place never gets crowded.
Light : Who judges that?
Dark : Nobody does, but everybody executes it.
Light : Are there other reasons?
Dark : Yes. Some people were born suffused with my, let's say, "touch". They chose my path delibrately, for reasons only they themselves, and no other, can fathom.
Light : Yet many walk beside you because they were coerced, forced, or belied to.
Dark : Of course, I do not deny that. But how many more had walked beside you simply out of resignation, simply because that is their so-called "norm"?
Light : (At loss for words)
Dark : (Continuing without missing a beat) Those who chose to walk by my side, willingly, know exactly what they are doing. Can you say the same of those who do so beside you?
Light : Well... almost.
Dark : ... Yet, my kind are the ones shunned, for you are the chosen one.
Light : (Seizing the opportunity) And why? Because we are doing forever better than you could ever achieve. Our actions may differ, but you would never take my path because you can't, whilst I do so because I chose not to.
Dark : Empty words. If a man walks beside either of us to with his own soul, he did so with his very choice, not with any outer coercion. I do not deny that you can overcome me, but it was long known that you would never vanquish me.
Light : We are made to do this forever, then.
Dark : No. As you said, our paths differ. Only when our paths cross do we clash. For now, though, our paths have diverged. Until we meet again.
Light : (Looked around as darkness descended. Saw nothing of Dark when light returns.) Until we meet again, then. Forgot to tell you that some people fear me more than they fear you, because I hold more unknowns than you, because I blind people without a cure, whereas they can see what is within your folds.
Dark : (Very faint) That would be the irony. Oh, by the way, the one who crossed our paths by deliberation? He walks by me.
Light : As he wishes.