1+1=1

When called upon to make a choice,
I oft consult an "inner voice".
Another me that waits inside,
to play out the role of foil or guide.
This me is contentious, and is inspired to argue.
But without this perspective, I lack a clear purview.
When I relish the day, he cherishes night.
When I lean to the left, his weight's on the right.
But why have this opponent? What's his purpose to life?
Why offer such counsel and, as quickly, breed strife?
To whom am I speaking when I ask "Yes or No?"
And if he's me in the first place, why didn't I know?
Every person can hear this voice from within,
For each of our heads can go into a spin...
Just seems strange that our minds, when all's said and done,
are obviously two, but regarded as one...