“When you build a new house, you shall make a fence for your roof, so that you do not bring blood upon your house, for someone will fall from it” (Deuteronomy 22:8). On a deeper level, the “roof,” as the highest place of the house, represents a person’s attribute of arrogance, haughtiness. The Torah commands that we “make a fence” for this negative attribute, that we reel it in. If not, we are warned, “someone will fall from it,” meaning, the haughty person is bound to meet his or her downfall, for Hashem casts down the haughty, but lifts up the humble.
Based on Shla”h, Parshas Ki Tetze