No, Avi K, it makes no difference whether he internalizes what is written, or even whether he *knows* what is written. There is no mention of such a requirement in the chumash, the gemara, the shulchon oruch, or anywhere else. The mitzvah itself protects, and mitzvos don’t need intent. A day-old baby is protected because it lives in a home with kosher mezuzos on those doors that need one. And there’s evidence in the gemara that even when the mitzvah is not being fulfilled, merely having a mezuzah with one offers some protection, regardless of ones intent or knowledge.
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