The next sentence of "a chopstick is easy to break" is "a bundle of chopsticks is difficult to break", which is a proverb about unity. This sentence comes from Mulan. Mulan first appeared in a narrative poem "Mulan Ci" in the Southern and Northern Dynasties, written in the Northern Wei Dynasty in the Southern and Northern Dynasties and originally recorded in Chen's "Ancient and Modern Music Record" in the Southern Dynasties.

A chopstick is easy to break because of its small strength; A pair of chopsticks are similar to each other, so they are very powerful, so even if they can be broken, they need a lot of strength. This proverb is to illustrate the strength after unity. It is often used to describe that the collective strength is stronger than the individual strength, or that Qi Xin's cooperation is more effective.