This passage resonated with my understanding of the fundamental principle of the field of decision analysis - a decision cannot be judged from the outcome. The quality of the decision can only be determine by the kind of effort that goes into it. It is foolish to use the quality of the outcome (that is apparent to everyone) as a proxy for the quality of the decision, for if we knew the outcomes resulting from our actions, we wouldn't have decisions to make. And yet, this conflation is the oldest mistake in the book of humankind.
Easwaran's article also refers to the indefatigable life force, that can be experienced whenever we serve selflessly with love. We are connecting to something bigger than us that nourishes and takes us forward. We cannot satisfactorily answer why this is the case, or what is really happening, but we can certainly experience this lightness and strength. The experience is nothing like the explanations we may have for it. :)