"Come now, "he [Danglars] said. Have you anything to fear? It seems to me, on the contrary, that everything is working out as you would wish."
"That is precisely what terrifies me," said Dantès. "I cannot think that man is meant to find happiness so easily! Happiness is like one of those palaces on an enchanted island, its gates guarded by dragons. One must fight to gain it; and, in truth, I do not know what I have done to deserve the good fortune of becoming Mercédès' husband." (5.22-23)
Oddly enough, it's at the most extreme moments – whether they be extremely happy or extremely grim – that we wonder if Fate might be lurking, exerting a negative influence.
Quote 2
[Eugénie Danglars:] "Well, my dear father, in the shipwreck of life—for life is an eternal shipwreck of our hopes—I throw all my useless baggage into the sea, that's all, and remain with my will, prepared to live entirely alone and consequently entirely free." (95.21)
Eugénie suggests that life is some combination of chance (the shipwreck) and choice (the decision to throw away the baggage.)
Quote 3
"Good!" Danglars exclaimed. "Everything is working out as I expected. I am now captain pro tem and, if only that idiot Caderousse can keep his mouth shut, captain for good. So, the only other eventuality is that the Law may release Dantès? Ah, well," he added, with a smile, "the Law is the Law, and I am happy to put myself in her hands." (5.147)
Danglars puts himself in a strange position, here. Even as he subverts the law, he places he surrenders his future to some larger concept of the "Law." We guess he's one for instant gratification.