Driven to Live

From what quarter of the universe do we derive the drive to perform at the top of our game? From deep within? From another dimension altogether? Both/And.
The forces that compel us to press hard and press forward are not all healthy ones, but we do not have the luxury of clearing out all dross before getting out of bed each morning. We can but fix our eyes on the prize that draws us ahead. We engage with our hopes and dreams in the context of our sufferings and circumstances, and don't look back. We trust because our intentions are good that whatever immaturities and brokenness we bring to the journey will be transformed into something new, beautiful and beneficial along the way.
And so back to the original question. From where does the drive to engage fully and participate in life unreservedly come?