He thought of [the Celestial City's] splendor and its color, in contrast to that of the rest of the world, and he wept as he raged, for he knew that he could never feel either wholly right or wholly wrong in opposing it. (4.346)
Here, we see Sam's internal conflict over his external one. On the one hand, he can't defeat the gods without destroying the Celestial City, but on the other hand, to destroy a thing of beauty is still to destroy a thing of beauty. As is often the case of life, he can't have it both ways. Bummer.