Mark 4:23

If anyone has ears to hear, let him hear. If anyone has the understanding to perceive the word of God, let him not withdraw, let him not turn his hearing to fables, but diligently lend his ear to examining those things which the truth has spoken, diligently employ his hands in fulfilling those things which he has already understood, diligently subject his tongue to preaching those things opportunely and inopportunely.

(ubi sup.) That is, if any man have a sense for understanding the word of God, let him not withdraw himself, let him not turn his ear to fables, but let him lend his ear to search those things which truth hath spoken, his hands for fulfilling them, his tongue for preaching them. There follows, And he said unto them, Take heed what ye hear.

If any man have ears to hear, let him hear. That is, that none of those things which are said to you by me should escape you.