《孟子·告子章句下·第三节》
孟子说： 《凯风》这首诗，是因为父母过错较小，《小弁》这首诗，是因为父母过错较大。
曰： 凯风，亲之过小者也；小弁，亲之过大者也。
Mengzi said: The poem "<Kai Feng>" is because the parents' faults are relatively minor, and the poem "<Xiao Bian>" is because the parents' faults are relatively big.