What is Santiago's view of his own sinfulness?

Throughout this final section, Santiago repeatedly apologizes to the marlin in a way that provides another way to read Santiago's sin. He says, "Half fish... Fish that you were. I am sorry that I went out so far. I ruined us both" (115). Santiago's transgression is no longer his killing of the fish, but going out too far in the ocean, "beyond all people in the world" (50). While the former sin helped account for the inescapable misery of the human condition, the latter focuses instead on avoidable misery brought about by intentional action. Santiago chose to go out so far; he did not need to do so, but in doing so he must surrender his prize, the marlin, to the jealous sea.

This understanding of Santiago's sin is strange because it seems to separate man from nature in a way which contradicts the rest of the novella. Going out too far is an affront against nature similar to the hubristic folly of Greek tragedy; he has courted disaster through his own pride. Nowhere previously in the novel was this apparent, though. The sea seemed to welcome him, providing him company and food for his expedition. There was no resistance from nature to his activities, except perhaps the sharks, but these were never made to be nature's avengers. This reading of Santiago's sin thus seems very problematic.