一言而非，四馬不能追；一言不急，四馬不能及。
Once one has spoken wrongly, a swift team of four cannot recall one’s words; though a thing is said unhurriedly, a team of four cannot catch up to it.
順風而飛，以助氣力；銜葭而翔，以備矰弋。
A hawk rests on an updraft as it flies to bolster its strength; it holds fragrant grass in its beak as a safeguard against hunters’ darts.