The Mezuzah's Lesson

There is a difference of opinion between Rashi and Tosfos as to whether a mezuzah is affixed parallel (vertically) or perpendicular (horizontally) to the door post. The widespread custom among Ashkenazim is to affix the mezuzah on an angle in order to fulfill both opinions. This teaches us an important lesson in shalom bayis, marital harmony. By regularly noticing the mezuzos in our home in a "compromise" position, on an angle - not exclusively like one opinion yet satisfying both of them, we are constantly reminded to also meet our spouse "half way", to compromise and be flexible.

(Rabbi Eliyahu Kitov)