Tefillin
The distinguished Rabbi Meier Jung (1859-1921) said of tefillin: "This religious act performed daily has done more to preserve and to further the high morality of our people than all the books on ethics that have ever been written. The same can also be said of other Mitzvos, though some have a double influence, one direct, making for immediate physical well-being, the other indirect, forming character by teaching constructive restraint through habitual action." Throughout the ages, Yidden have risked their lives to preserve this mitzvah. Even in the concentration camps, survivors relate of the measures Yidden went through to don tefillin