The characters combine to create a powerful metaphor: the belly (mind/heart) of a wise and powerful leader (`宰相`) is so immense (`肚里`) that it's possible (`能`) to sail a boat (`撑船`) inside it. This highlights that a great leader must possess immense tolerance and forgiveness.
This idiom is deeply rooted in Confucian values, which prize magnanimity (大度, dàdù) and composure as essential qualities of a virtuous person, particularly a leader or scholar (君子, jūnzǐ). A person in authority was expected to rise above petty squabbles and personal grievances for the greater good. The ability to forgive and tolerate the shortcomings of others was seen as a sign of immense inner strength, wisdom, and moral cultivation. A useful Western comparison is the phrase “to be the bigger person,” but with a crucial difference. “Being the bigger person” often refers to a specific action—choosing not to retaliate in one instance. In contrast, `宰相肚里能撑船` describes a permanent state of character. It’s not just about one action, but about having an inherently vast and unshakable capacity for forgiveness. It is a fundamental trait of a respected individual, not just a situational choice.
This idiom is still widely used and understood in modern China. It functions as a high compliment, a piece of advice, or even a sarcastic jab.
It's a well-known proverb that can be used in both formal speeches and informal chats, though its classical origin gives it a slightly more formal and respected flavor.