|Photo Geof Kern|
When you build a new house, you shall make a guard rail for your roof... [Ki Teitze 22:8]
A roof, being the highest part of any structure, alludes to the ego, which gives a person an elevated impression of himself.
Thus, in order to prevent a person from ''falling off his roof'' by allowing his feelings of swollen self-esteem to degenerate into selfishness, we are warned to ''make a guard-rail for your roof'' - to carefully control and temper the ego with ''guard-rails''.
Based on Likutei Sichos vol 24 p 140 Lubavitcher Rebbe