Ah, but they are the object of a G-dly commandment.
It is obviously this last factor that makes them what they are: sacred. And as sacred objects their use is very restricted.
She wants to be "just as Jewish as men":
Problem: she already IS just as Jewish as men! (If not more so. After all it is she who transmits the Jewish lineage; not her husband.) Furthermore, since Tefillin are an object of a G-dly commandment they are sacred and cannot be used to make a personal point.
She wants to fulfill a G-dly commandment:
Problem: No problem. There is no problem with wanting to fulfill a G-dly commandment. As a matter of fact, that is an excellent objective. So, does she already fulfill all the commandments which
When you are given a daunting task by someone who knows you won't be able to do it perfectly, you must nonetheless do itShe already fulfils all her Divine Duties and wishes to take on this auxiliary commandment as well:
Problem: Fantastic! She may put on Tefillin. First she must study the laws of Tefillin, which have very strict requirements: constant focus on the Tefillin; perfectly clean body; entirely pure mind etc. Upon studying these laws and meeting these requirements she may certainly put on Tefillin.
Now you may ask: "are you telling me that all men who wear Tefillin live up to all the above conditions?"
The answer is: No! As a matter of fact most men don't live up to half of those conditions. However, men have an "obligation" to don Tefillin.
When you are given a daunting task by someone who knows you won't be able to do it perfectly, you must nonetheless do it. However, if you were not asked to take on a daunting task, you must make certain that you are completely capable before undertaking this responsibility.
In other words, this doesn't mean that men are more capable than women. This says that men are commanded to do so, and by virtue of the commandment, capability is rendered irrelevant. Women, however, are not obligated to put on Tefillin, capability suddenly becomes a major issue.
Well, does a man put on Tefillin or does his hand put on Tefillin? Technically it is his hand that is donning the Tefillin, but of course it is he, in his entirety, that is fulfilling the