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Romans 4:21

Most fully knowing, that whatsoever he has promised, he is able also to perform.

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The verse in its languages

Vulgate (Clementine)
plenissime sciens, quia quæcumque promisit, potens est et facere.
Greek New Testament (SBLGNT)
καὶ πληροφορηθεὶς ὅτι ὃ ἐπήγγελται δυνατός ἐστιν καὶ ποιῆσαι.

The Fathers on this verse

St Augustine A Treatise on Rebuke and Grace, There is a Greater Freedom Now in the Saints Than There Was Before in Adam

Certainly a greater liberty is necessary in the face of so many and so great temptations, which had no existence in Paradise, a liberty fortified and confirmed by the gift of perseverance, so that this world, with all its loves, its fears, its errors, may be overcome: the martyrdoms of the saints have taught this. In fine, he [Adam], not only with nobody to make him afraid, but, moreover, in spite of the authority of God’s fear, using free will, did not stand in such a state of happiness, in such a facility of [not] sinning. But these [the saints], I say, not under the fear of the world, but in spite of the rage of the world lest they should stand, stood firm in the faith; while he could see the good things present which he was going to forsake, they could not see the good things future which they were going to receive. …

St Augustine A Treatise on the Predestination of the Saints, In What Respects Predestination and Grace Differ

Moreover, that which I said, “That the salvation of this religion has never been lacking to him who was worthy of it, and that he to whom it was lacking was not worthy,”, if it be discussed and it be asked whence any man can be worthy, there are not wanting those who say, by human will. But we say, by divine grace or predestination. Further, between grace and predestination there is only this difference, that predestination is the preparation for grace, while grace is the donation itself. When, therefore the apostle says, “Not of works, lest any man should boast. …

St Augustine Expositions on the Book of Psalms, Psalm XCIV

18. “Wilt Thou have anything to do with the stool of iniquity, who makest sorrow in learning?” ( ver. 20 ). He hath said this, No wicked man sitteth with Thee, nor shalt Thou have anything to do with the stool of iniquity. And he giveth an account whereof he understandeth this, “For Thou makest sorrow in learning.” For from this, because Thou hast not spared us, do I understand that Thou hast nothing to do with the stool of iniquity. Thou hast this in the Epistle of the Apostle Peter, and for this reason he hath adduced a testimony from the Scripture: “for the time is come,” he saith, “that judgment must begin at the house of God;” that is, the time is come for the judgment of those who belong to the house of God. …

St John Chrysostom The Homilies of St. John Chrysostom on Paul's Epistle to the Romans, Homily VIII on Rom. iv. 1, 2

Ver. 21 . “And being fully persuaded that what He had promised, He was able also to perform.”

St John Chrysostom The Homilies of St. John Chrysostom on Paul's Epistle to the Romans, Homily XVII on Rom. x. 1

“If thou confess with thy mouth the Lord Jesus, and believe in thy heart that God hath raised Him from the dead, thou shalt be saved.” Then again that we may not seem to be making it contemptible by showing it to be easy and cheap, observe how he expands his account of it. For he does not come immediately to the words just given, but what does he say? “But the righteousness which is of faith saith on this wise; Say not in thine heart, Who shall go up into heaven? (that is, to bring Christ down); or, Who shall descend into the deep? (that is, to bring up Christ again from the dead.”) For as to the virtue manifested in works there is opposed a listlessness, which relaxeth our labors, and it requireth a very wakeful soul not to yield to it: thus, when one is required to believe, there are reasonings which confuse and make havoc of the minds of most men, and it wants a soul of some vigor to …

St John Chrysostom The Homilies of St. John Chrysostom on Philippians, Colossians, and Thessalonians, Colossians 1:21,22

In everything then yield we to Him: for this is to glorify God, not to demand of Him an account of what He doeth. In this way too did Abraham give glory to God; “And being fully persuaded,” we read, “that what He had promised, He was able to perform.” ( Rom. iv. 21 .) He did not ask about the future even; but we scrutinize the account even of the past. See how great folly, how great ingratitude, is here. But let us for the future have done, for no gain comes of it, but much harm even; and let our minds be gratefully disposed towards our Master, and let us send up glory to God, that making for all things an offering of thanksgiving, we may be counted worthy of His lovingkindness, through the grace and love toward man of His Only-begotten, with whom, &c.

St Leo the Great Sermons, On the Feast of the Nativity, VI

Although, therefore, that infancy, which the majesty of God’s Son did not disdain, reached mature manhood by the growth of years and, when the triumph of His passion and resurrection was completed, all the actions of humility which were undertaken for us ceased, yet to-day’s festival renews for us the holy childhood of Jesus born of the Virgin Mary: and in adoring the birth of our Saviour, we find we are celebrating the commencement of our own life. For the birth of Christ is the source of life for Christian folk, and the birthday of the Head is the birthday of the body. …

St Leo the Great Sermons, On the Feast of the Epiphany, III

Taught then, dearly-beloved, by these mysteries of Divine grace, let us with reasonable joy celebrate the day of our first-fruits and the commencement of the nations’ calling: “giving thanks to” the merciful God “who made us worthy,” as the Apostle says, “to be partakers of the lot of the saints in light: who delivered us from the power of darkness and translated us into the kingdom of the Son of His love:” since as Isaiah prophesied, “the people of the nations that sat in darkness, have seen a great light, and they that dwelt in the land of the shadow of death, upon them hath the light shined.” Of whom he also said to the Lord , “nations which knew not thee, shall call on thee: and peoples which were ignorant of thee, shall run together unto thee.” This day “Abraham saw and was glad,” when he understood that the sons of his faith would be blessed in his seed that is in Christ, and fores …

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