John Gill Commentary Luke 6:45

"The good man out of the good treasure of his heart bringeth forth that which is good; and the evil [man] out of the evil [treasure] bringeth forth that which is evil: for out of the abundance of the heart his mouth speaketh." — Luke 6:45 (ASV)

A good man out of the good treasure of his heart This, because of its suitableness and agreement with what goes before, is placed by Luke here; though, according to Matthew, it was spoken at another time and place, unless it should be a repetition there; (See Gill on Matthew 12:35)

for of the abundance of the heart his mouth speaketh . The Vulgate Latin, Arabic, Ethiopic, Syriac, and Persic versions, leave out the word "his"; and the two latter read "lips", instead of "mouth"; (See Gill on Matthew 12:34).