From the early Church Fathers to now.
“It is the part of man to prepare the soul: and of the Lord to govern the tongue.”
“Assuredly, as to what is written, "The preparation of the heart is man's part, and the answer of the tongue is from the Lord," they are misled by an imperfect understanding, so as to think that to prepare the heart—that is, to begin good—pertains to people without the aid of God's grace. Be it far from the children of promise thus to understand it!”
“It is for man to prepare the soul, etc. It is certain that neither to prepare the mind, nor to govern the tongue, nor to do any good thing, we are able without divine grace; because without me, he says, you can do nothing (John XV, 5). How then is it for man to prepare the mind, and for God to govern the tongue, unless this specifically signifies in the time of persecution? about which the Lord said: But when they hand you over, do not be anxious about how or what you are to speak; for it will be given to you in that hour what you are to speak (Matthew X, 19).”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.