John Chrysostom : "Take heed, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God." For from hardness unbelief ariseth: and as in bodies, the parts that have become callous and hard do not yield to the hands of the physicians, so also souls that are hardened yield not to the word of God. For it is probable besides that some even disbelieved as though the things which had been done were not true. Therefore he says, "Take heed lest there be in any of you an evil heart of unbelief in departing From the living God." For since the argument from the future is not so persuasive as from the past, he reminds them of the history, in which they had wanted faith. For if your fathers (he says) because they did not hope as they ought to have hoped, suffered these things, much more will you. Since to them also is this word addressed: for, "To-day" (he says) is "ever," so long as the world lasts. — Homily on Hebrews 6 John Chrysostom : Above all things indeed, he says, "let there not be an evil heart of unbelief." But even suppose there should be, let no man despair, but let him recover himself; for as long as we are in this world, the "To-day" is in season. — Homily on Hebrews 6 Oecumenius : Fearful of the saying. See, he says, lest there be in any of you an evil heart of unbelief, from the rest, the kingdom of heaven. — The Pseudo-Oecumenian Catena on Hebrews Oecumenius : "an evil heart." There are many wicked hearts of unbelief. For there is a wicked heart of unbelief, which does not believe, but is greedy for gain, is arrogant, is drunken, and many other things. Moreover, and incomparably, a heart is a wicked heart of unbelief, which departs from the faith in God. Therefore, see," he says, "that there never be in any of you an evil heart of unbelief." And of unbelief, I say, he means the departure from the living God. And he says well. An evil heart of unbelief. For there is also a good heart of unbelief, as in, "Do not believe every spirit, but test the spirits, whether they are of God." (1 Jn. 4:1) — The Pseudo-Oecumenian Catena on Hebrews Oecumenius : In the departing, that is, through unbelief, from the living God. For otherwise unbelief does not find a way unless one departs from God. For as long as one holds on to God and trusts in Him, as the Almighty, he considers nothing impossible. — The Pseudo-Oecumenian Catena on Hebrews Photios I of Constantinople : Many have evil, unbelieving hearts. To have an evil, unbelieving heart means to have no faith. Evil is the love of property, wantonness, alcohol, and the like.… Beware that your heart may not become evil and unbelieving; unbelief, he says, is separation from the living God. — FRAGMENTS ON THE EPISTLE TO THE Hebrews 3.12 Shepherd of Hermas : Thinking, then, that they could find a better, they wander and become wretched, and enter upon pathless places. But those which fell into the fire and were burned are those who have departed for ever from the living God. — Shepherd of Hermas, Vision 3 Theodore of Mopsuestia : This word comes to ones who have already come to faith, as I understand it. So that it is fitting for you to praise the same things so that you might remain in the same opinions once and for all. This then Paul says, because those who believe and who have received the Spirit "share" in the substance of Christ, since they have received some physical fellowship with him. Then finally it remains to guard thoroughly this beginning with an uncontaminated mind. — FRAGMENTS ON THE EPISTLE TO THE Hebrews 3.12-14