He expanded on that idea later in the prayer:
In the light of the new year, it seems a bit bland, but I guess that's the way of prayers: they resonate with your emotions. I was decompressing from my pre-Christmas rush to complete some projects and this caught me like a rogue wave. Here's the full text of the prayer.
And let us do what we can,
Not climb every mountain,
But, dismissing pipe dreams,
Climb one splendid mountain,
Doing—not less than, not more than—but precisely what we can,
That our life may be filled with attainable meaning.