Who or what is 'Providence' in chapter 32 of The Adventures of Huckleberry Finn?

Providence, as the name suggests, simply refers to what God provides, events in life and their outcomes that are divinely pre-ordained. Whatever happens in life—good, bad, or indifferent—it's because God wanted it that way, and there's absolutely nothing that mere mortals such as ourselves can do about it.

In the context of chapter 32 of The Adventures of Huckleberry Finn Huck believes that Providence has been very good to him thus far, allowing him to spin Mrs. Phelps a tall story about how he came to wind up on her farm. But he thinks that Providence is running out on him just when he needs it the most. The sudden realization hits him that he can't keep up the pretense for much longer; he's bound to be tumbled sooner or later.

But fortunately for Huck, he's very much mistaken. For Providence continues to stick by him as Mrs. Phelps introduces Huck to her husband as Tom Sawyer, their nephew. Huck is mightily relieved, because now he can easily pretend to be his old pal. He doesn't have to continue spinning an increasingly implausible yarn; he can simply tell the Phelpses everything he knows about the Sawyer family. And of course, he knows a lot.