A.T. Robertson Commentary Matthew 13:9

"He that hath ears, let him hear." — Matthew 13:9 (ASV)

He that hath ears let him hear (ο εχων ωτα ακουετω), So also in 11:15 and 13:43. It is comforting to teachers and preachers to observe that even Jesus had to exhort people to listen and to understand his sayings, especially his parables. They will bear the closest thought and are often enigmatical.