Again He subjoins, “If any man have ears to hear, let him hear.” For He had not clearly shewn them, what those things are which proceed out of a man, and defile a man; and on account of this saying, the Apostles thought that the foregoing discourse of the Lord implied some other deep thing.
Wherefore there follows: “And when He was entered into the house from the people, His disciples asked Him concerning the parable;” they called it parable, because it was not clear.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Vict. Ant. e Cat. in Marc.