Speech from the movie a beautiful mind:

I’ve always believed in numbers and the equations and logics that lead to reason.
But after a lifetime of such pursuits, I ask:
“What truly is logic?”
“Who decides reason?”

My quest has taken me through the physical, the metaphysical, the delusional — and back.
And I have made the most important discovery of my career, the most important discovery of my life: It is only in the mysterious equations of love that any logic or reasons can be found.

I’m only here tonight because of you [wife, Alicia].
You are the reason I am.
You are all my reasons.
Thank you.