I would conclude that good has prevailed over evil in this case. It is completely typical of Crusoe to weigh life in the balance this way, as if he is placing good and evil on a set of scales and seeing which is heavier, or as if he is keeping a balance sheet and trying to decide if life yields more evil or more good.

Thinking it through rationally, Crusoe recognizes that it is bad ("evil") that he is alone on a desert island with no hope that he will be rescued by another vessel. However, he realizes it is good he is alive and not dead like the rest of his shipmates. He may yet find a way to survive on the island without having to be rescued, which is a positive. This, in fact, is what he does.

This is a classic glass half-full, glass half-empty response, which shows that there is truly a silver lining to every cloud. Note the way that Robinson Crusoe starts off by focusing on the evil of what has happened to him. He recognises that he is in a desperate plight as he is alone on a "horrible island" without the slightest chance of being rescued. On the one hand, we can see the truth of this: he does truly face an unenviable position. Yet, he is able to go on from this and say that he is actually fortunate, because apart from facing the terrible fate that he is forced to endure, he is also incredibly lucky. He, unlike his fellow sailors, did not end his days in a watery grave after suffering a terrible death by drowning during the shipwreck. Robinson Crusoe thus demonstrates an ability to see both perspectives of the issue, finally using the positive aspect to give him strength to face the day and carry on with his life.