In parashah Ki Tetzé, appears the mitzvah of making a fence on the roof of a new house. In every mitzvah of the Torah, besides from the teaching for its material fulfillment, there is also an inner and deep teaching for the service to G-d of the Jew. What does the mitzvah of the fence teach us for our daily service to HaShem?
Just as in a material building is necessary to build a fence on the roof to prevent, G-d forbid, that a person falls from it, so, and much more, we, Jews, must build a fence on every new building in the service of G-d when we left the "world of Torah" to serve G-d in this world. We must know that we will find new experiences in the service of the Creator, which until that moment we had not faced. To avoid a spiritual fall, G-d forbid, we must make a fence. We must also add new fences that will help preserve it. This is so at each stage of our service to HaShem, in each morning, when the Jew begins his Shacharittefillah and studies Torah and then dedicates himself to his work, he must prepare a fence and erect his own fences that will help him to face properly the trials that will find. By building a correct "spiritual fence", the Jew can succeed in continuing G-d's service even within his occupations and sanctifying them, without any fall, G-d forbid.
The previous Rebbe, Rabbi Yosef Yitzchak of Lubavitch teaches that on each Rosh HaShana eve the Jew assumes upon himself the strict observance of the positive mitzvot and be more careful of the negative mitzvot, And this good halachic directive was said to each Jew, to the greater tzadik and to the Jew who is at the beginning of his path in the service of G-d. In each Rosh HaShanah there is a new light for the world, a light that did not exist before since the creation, and a fence must be built for the new building, and because of that ours "spiritual fence" we will deserve to build a new house for G-d. , the third Bet HaMikdash in Jerusalem and G-d will make a wall of fire around it, soon, in our days.
