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I believe this is a strictly academic question. Correct me if I'm wrong.

Many of the restrictions enacted by the Rabbis (as opposed to those extrapolated from the Torah) were done so in order to prevent one from performing a forbidden act. The formulation of such preventative restrictions is often something like, "the Rabbis forbade X so that one will not come to Y", where Y is the Biblical prohibition. Do these preventative measures fall into two conceptual categories or is the following a spurious distinction? If the distinction is a real one, does it have practical ramifications?

  1. cases where habituation to X as acceptable will unconsciously persuade one to believe that Y is acceptable as well

  2. cases where X is sufficiently similar to Y that one may unknowingly perform Y when one thinks he is doing X

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You're actually probably more likely to get an answer to this one if you throw in some pertinent Yeshivish terms. Also, consider adding more tags. –  Isaac Moses Jan 5 '10 at 3:58
    
@IsaacMoses LOLOL! Somehow that just really cracked me up. –  Seth J Mar 27 '12 at 13:21

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up vote 4 down vote accepted

There are a few different cases of "don't do X lest you do Y." Let me try to state a few off the top of my head, and hopefully that can get you started. This is a pretty technical and advanced question; I wish I could do a better job explaining it, but I apologize as I'll probably lose some readers here.

A.) "Don't do action X because others will assume that what you're doing is instead action Y." E.g. don't eat beef mixed with almond milk (action X), as OTHER people will think you're eating beef mixed with "real" milk (action Y). The mistake here is that almond milk isn't dairy milk. You yourself will never make the mistake, but others might. This is known as "maris ayin."

There is a leniency about this: The Pischei Teshuva, Yorah Deah 87:10, says that according to some opinions, if action Y is only prohibited rabbinically anyhow, and you're doing X in the privacy of your home with no onlookers, it's permissible. In the above case, for instance, you could eat chicken mixed with almond milk IN THE PRIVACY OF YOUR OWN HOME. (According to this opinion.)

B.) "If you do action X, everyone knows that action X is not action Y; but you or others might not discern a Halachic distinction between X and Y, and therefore will assume that Y is also permissible."

A terrific example is Rambam, Maachalos Asuros 9:4. If the rabbis allowed chicken mixed with milk (action X), everyone knows that chicken is not beef, but people would see no Halachic distinction between them, and therefore think it's okay to eat beef with milk (action Y). The Rambam's language is "so the people don't rationalize."כדי שלא יפשטו העם ויבואו לידי איסור

Another good one is Mishnah Ediyot 5:2. Note the concern is about the SAME INDIVIDUAL who does action X may do action Y.

As rationalization is a dangerous thing, these cases tend to be "no ifs, ands, or buts." Note that chicken-and-milk has less leniencies than other rabbinic prohibitions vis-a-vis meat-and-milk. (Need citation here.)

C.) "If you do action X, you may forget yourself and perform action Y." The usual language here is "lest one come to ..." or "because of the routine leading to a sin ..." גזירה משום הרגל עבירה. Don't have meat and milk on the same table, as you may forget what you're doing and eat both. (Rambam Ma'achalos Asuros 9:21). But there are more ways around this, e.g. if it's two strangers at the table eating off different placemats.

A similar case is "if you do action X, you might lose self-control and knowingly do action Y." E.g. a single Jewish guy and gal shouldn't share a hotel room.

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I guess I was wrong. I'm impressed with your ability to dicsuss abstract Halachic concepts without resorting to terminological shortcuts (Hebrew jargon). However, you should feel free to use technical terms if you think it'll help you write more clearly. A link to a glossary or a quick definition the first time you use the term would be helpful in those cases. However, if you really think that the only people who would be at all interested in what you're writing are already familiar with the terms, you can just go ahead and use them as is. –  Isaac Moses Jan 5 '10 at 15:28
    
Side point: Is it really forbidden to mix almond milk with meat? Could you cite a source? Does the same apply to soy and rice milk? I guess not, since Kosher Subway offers soy-based fake cheese on meat sandwiches. –  Isaac Moses Jan 5 '10 at 15:34
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Shulchan Aruch (Yoreh Deah 87) says not to eat meat with almond milk, unless you leave almonds on the table so everyone understands. There's a strong argument among contemporary poskim (e.g. Badei HaShulchan) that today everyone knows about fake milk, so the sign isn't needed. I wanted to explain that above, but it would have been too complicated. I've heard (Rakefet?) When non-dairy creamer was first introduced, most kosher organizations asked that it be served at weddings in its original packaging, not a silver carafe. Today, that requirement has been relaxed as we all know it's "fake". –  Shalom Jan 5 '10 at 16:42
    
Fascinating. I think this material belongs right here, in the comments, or in a separate question. It just happens to be the example you chose to illustrate the concept of things looking bad. –  Isaac Moses Jan 5 '10 at 16:55
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Shalom - Thanks for clarifying all that! A similarly fascinating comment was made by the Rav regarding timers and mar'is ayin. He said the first generation of people to employ them to turn things on on shabas were m'chal'lei shabas, but by now it's well-known enough to be acceptable. (There he is weighing in on the mutability of standards for mar'is ayin as well.) –  WAF Jan 5 '10 at 23:42

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