The first time I studied Leviticus carefully (about 13-14 years ago), one of the things that stood out to me was the fact that ritual uncleanness transfers very easily, but cleanness does not. If someone is unclean for whatever reason, touching someone or something clean renders the clean person or thing unclean. It doesn't go the other way. Going from unclean to clean requires certain ritual ceremonies, and it often takes time, sometimes even a week or more. Going from clean to unclean simply requires exposure.

That's one of the reasons that it's particularly impressive that in the gospels Jesus touches people who have skin diseases or unhealthy menstrual conditions when he heals them, since those conditions were ritually unclean under the Torah ritual system. And it's clear that this wasn't out of some notion that the Torah ritual system was an ancient superstition that should be discarded. He insists in his teaching about Torah that it is the word of God and will be eternally true. But he also insists that it is eternally true not because it perpetually applies but because he fulfills it himself.

So what's going on when he heals people whose conditions would normally require a week or more of cleansing ceremonies? Sometimes he does tell them to go to the priests in the temple and do the ceremonies the Torah prescribes. Other passages don't mention him saying that. But certainly what's odd about it is that he touches them himself, when there are plenty of cases where he heals people without touching them. Are we to assume that he takes on the uncleanness himself voluntarily and then has to go through the rituals to be cleansed himself? The first would be a nice symbol of how he elsewhere describes what he would do at the cross, but I don't think that's the right way to think about these cases, because he's even telling them in some cases that he has simply made them clean (e.g. Matthew 8:3, although there he does say to make the sacrifices with the priest, but he says it's to be done for proof, not for actually making the guy clean).

I've long thought of this as just an exception. Normally cleanness doesn't spread to the unclean, but these passages are presenting Jesus as demonstrating something about himself as different. He can make unclean clean instantly, and that shows that he's superior to the Torah ritual system, which only looked forward to him.

But that turns out to be wrong, on closer inspection. For one thing, it can't be mere superiority. The Bible is clear across the entire canon that God can't entangle himself with sin or sinful beings, and that's why sacrifices are needed to begin with to deal with that sin. Isaiah 59:2 describes sin as separation from God. Jesus couldn't, merely by being God, do something that the scriptures clearly present God as not being able to do without sacrifice. So it has to be tied to sacrifices in some way, and it would be nice if we could find something explicit in the ritual ceremonies that looks more like what Jesus was doing in these passages.
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It turns out that these cases in the gospels are not unprecedented. There is at least one mention in Leviticus of a case where holiness spreads to something common (although it isn't described as cleanness spreading to something unclean). That's in the description of the sin offering in Leviticus 6:27, where anyone who touches the flesh of the animal offered as a sin offering is made holy. I know of no other place where something is made holy merely by touching something in the entire Hebrew Bible, although maybe there are others that I just never connected with this issue.
What's going on in the gospel passages, then, given that there is a precedent for holiness spreading from a sin offering to something else? Perhaps the implication is that Jesus could reverse the normal flow of the symbolic status of ritual uncleanness to the clean because, as a future sin offering, he is in fact able to touch something and make it holy, whereas being divine without being the sin offering wouldn't do that. That seems to make these things fit together a lot better than the way I had been thinking about it.

I once thought David Hume's reasons for being skeptical about scientific laws were inconsistent with his arguments against miracles. He argues that we can't know about scientific laws or causes, because all we perceive are one thing happening followed by another thing happening. We don't perceive any causing, just the things we take to be cause and effect. Our taking it to be cause and effect is thoroughly irrational, Hume says, and thus we know nothing about whether there are any causes or scientific laws. For all we know, a ball you throw into the air could come back down, as you expect it, or it could turn into a bird and fly away. We expect it to do the former, but there's no reason we have to think it can't do the latter.
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Hume goes on to say that we should never believe in miracles, because you should always proportion your belief to the evidence, and there is zero evidence for miracles. He rules out the very possibility of miracles, it seems, and he does this in the very same work where he has spent so much time setting up worries about whether our entire scientific understanding of the world might be wrong, leaving us with the result that, for all we know, basketballs might turn into seagulls and fly away. How can he consistently say both of these things?

But then I read Hume more closely in subsequent readings, and I came to the conclusion that Hume's approach is consistent after all. What he says in his skepticism about science is that we don't know there are scientific laws of the sort that we believe in if we think one thing makes another happen. He also says that, for all we know, unexpected things that would seem to violate the laws of physics that we believe in could be possible. But he does go on to give a pragmatist account of why we might as well believe in scientific laws anyway, since it's served us well so far, and it's not as if we can help it anyway. It's also not as if we have a choice.

But then in the miracles chapter, he gives a careful argument. He first defines probability as how often something happens in our own personal experience. Then he says that, if you haven't experienced miracles, it follows that miracles have zero probability. But why, then, could he say that plants could sprout legs and start walking around, as far as we know? Isn't that like a miracle? But he's careful here. If we believe that a plant did such a thing, we'd be believing in a miracle. We shouldn't do that, because it has zero probability. It's never happened, in my experience, so I should think it has zero probability. At the same time, I can't rule it out. So it's not impossible, as far as I know. If I did witness it, I'd have to proportion my beliefs with the evidence I then had. But as it is, I shouldn't believe in such things. I should just believe in their possibility, but I shouldn't allow for anything more than zero probability.

The key here is in defining probability in terms of how often it's happened in your experience, while defining possibility in terms of whether it's consistent with your experience. Something could then have zero probability but be well within the realm of possibility. So, because of that, I came to think that Hume's view was indeed consistent, even if it's a strange set of views.
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But now I've become convinced again that there's a deep inconsistency in Hume's approach to these two issues. It has to do with his willingness to extend pragmatist arguments toward functioning the way we ordinarily do with respect to the scientific skepticism he begins with, while not extending pragmatism toward functioning the way we ordinarily do with the issue of miracles. He accepts our ordinary views on scientific laws, even though he insists that such beliefs are irrational and not grounded in anything more likely to produce true beliefs than crystal-ball gazing, at least as far as we can be sure. He relies on the testimony of other people in order to believe in regularities in nature that he can rely on to live his life. He refuses to accept the testimony of other people when it comes to miracles, however.