The pasuk says that Moshe told Korach and his followers: זאת עשו קחו לכם מחתות קרח וכל עדתו - “Do this: Take for yourselves firepans – Korach and his entire assembly.” (Bamidbar 16:6). Rashi makes an interesting comment: “We only have one G-d, one aron, one Torah, one mizbayach, and one kohen gadol.”
The Beis Yisroel answers that the keruvim symbolized unity as well. Even though there were two of them, they faced each other. Therefore, despite the fact that they were two physical units, they are really just a single entity. The keruvim are attached to the aron. What is in the aron? The Torah is in the aron. The Torah is the great unifier in Klal Yisroel.
Although Klal Yisroel is supposed to be One Nation, the truth is, there are significant divisions and divisiveness. However, Torah is the big unifier. Sometimes it may be only for a brief moment or for several hours during the siyum hashas ceremony—but people feel connected to each other simply because we learned the same daf, we completed the same masechta, and we feel that unifying bond of sharing a common Torah.