Origen

(in Prov. 1.) Now a parable is a narration of an action as done, yet not done according to the letter, though it might have been, representing certain things by means of others which are given in the parable. An enigma is a continued story of things which are spoken of as done, and yet have not been done, nor are possible to be done, but contains a concealed meaning, as that which is mentioned in the Book of Judges, that the trees went forth to anoint a king over them. (Judges 9:8.) But it was not literally a fact as is said, A sower went out to sow, like those facts related in history, yet it might have been so.