I love this album and this track particularly, so I will go ahead and get into this conversation.
I don't think that StR is about destiny at all, quite the opposite. The phrase that precedes it is "when boundaries are found." I find this song to be a nice corrective to the often silly over-the-top lyrics in all kinds of music that promote the idea of anything is possible, just dream it and it will happen, etc. That's the kind of thing that puts too much stock in "Destiny." I suppose you could argue that a typical understanding of destiny is this idea that if something is meant to be, it will be, if not meant to be, it won't happen. I don't subscribe to that. But I do admit it is very popular. I don't like it because it is fatalistic, and goes against the usually complementary idea of working hard to strive and achieve. So if destiny has predetermined things, then what is work and preparation for?
I listened to this album nearly every day while going through a personal transformation, one where I had grandiose visions of what this change would mean. It didn't take me long to see that those visions were just that: grandiose, and not rooted in a realistic expectation of what payoff could be expected from the investment I was putting in. For me, "surrender to reason" became a helpful expression of staying grounded, and not expecting life to simply go by the whims of fate, destiny, or some universe-directing-things fancy. I found my boundaries, my limitations, and I surrendered to reason: to the reality that for now, this was as far as I would or could go.
So for me, the invoking of Grace in those lead up lyrics is more about being willing to take chances, to experiment and be a risk taker. Gracefulness in the face of that means it's ok to fail, or if fail is too strong a concept, then how about it's ok to fall short? That's finding the boundary, the limitation.
It doesn't mean that you still get everything you want at the end of it because of fate. But that doesn't mean the road is over, it might be just the reality check needed to re-assess how to go at your goal again and redefine the boundary for the next time around.