A Riddle For The Ages

What am I?

I am the sun that rises in the east,
and sets in the west.

I am the mountain that holds your dearest wish at it's peak,
and the valley you must cross before climbing.

I am the star that shines bright during the night,
glowing like a beacon as I guide you Northward.

I am the nightmare that haunts you when sleep comes,
and teaches you of life when it is denied.

I am the wind that speaks to you in whispers,
and guides you with a gentle but firm hand...

I am what lives inside your heart and soul,
telling you what is right and what is wrong...

What am I that controls you so,
that can move you as if you were a marionette?

You are nothing,
but everything to me.

I cannot breathe without your presence,
or feel without your touch.

I control you,
but you control me as well.

So, what am I?