a house divided against itself cannot stand
家庭、群体、团队内部不团结，很难成功或持久
正式·警示内部不团结的后果
英文释义
internal conflict within a group or organization will lead to its downfall
例句
The team kept arguing, and a house divided against itself cannot stand—they lost the match.
典故来源
源自《圣经·马太福音》，林肯在演讲中引用，强调内部分裂必然导致失败。