How far we go can only be determined by our willingness to keep moving forward.
A journey of a thousand mile begins with a step. Until we take that step, and continue enduring the movement, despite the odds, we will never get to the finish line.
A person is only limited by their own will. The moment you put a limit to how far you can go, that is how far you can go. No one can stop you from reaching the distance, except you.
Remember why you started, that is enough zeal to push you beyond your boundaries; and except the thing chasing you is big enough to drown you, you won't have the zeal to chase your destiny.