Fate & Free Will

From Elizabeth Gilbert's Eat, Pray, Love:

Destiny, I feel, is also a relationship- a play between divine grace and
willful self-effort. Half of it you have no control over; half of it is
absolutely in your hand, and your actions will show measurable
consequence. Man is neither entirely a puppet of the gods, nor is he
entirely the captain of his own destiny; he's a little of both. We gallop
through our lives like circus performers balancing on two speeding side-by-side
horses- one foot is on the horse called "fate," the other on the horse
called "free will." And the question you have to ask every day is- which horse
is which? Which horse do I need to stop worrying about because it's not under my
control, and which do I need to steer with concentrated effort?