Musar zu Amos 9:6

And our sages have said (Derech Eretz Zuta 9): "If there is machloketh in a household, in the end it will be destroyed. If there is machloketh in a synagogue, in the end it will be disbanded. What is more, in the end it will be laid waste. If there is machloketh in the city, there is bloodshed in the city. Two Torah scholars who live in the same city and, similarly, two courts in the same city, if there is machloketh among them, they are destined to expire. Furthermore, a contentious court is the destruction of the world. Know this to be so, for so long as there is peace in the lower tribunal, there is peace in the higher tribunal, as it is written (Amos 9:6): 'He builds His chambers in the heavens.' When? (Ibid.): 'when His bond is founded upon the earth." That is, when Israel are united in one bond and live in peace with one another.