14:1 - Him that is weak in the faith receive all of you, but not to doubtful disputations.

Origen Against Celsus Book I
Celsus introduces the Jew disputing with Jesus, I resolved to prefix this preface to the beginning (of the treatise), in order that the reader of our reply to Celsus might fall in with it first, and see that this book has been composed not for those who are thorough believers, but for such as are either wholly unacquainted with the Christian faith, or for those who, as the apostle terms them, are "weak in the faith; "regarding whom he says, "Him that is weak in the faith receive ye."[13]
Cyprian Epistle LXXIII
If, then, she is the beloved and spouse who alone is sanctified by Christ, and alone is cleansed by His washing, it is manifest that heresy, which is not the spouse of Christ, nor can be cleansed nor sanctified by His washing, cannot bear sons to God.[15]

14:2 - For one believes that he may eat all things: another, who is weak, eats herbs.

Clement of Alexandria Stromata Book VI
"Now the weak eateth herbs," according to the noble apostle.[4]
Origen Commentary on Matthew Book XII
worthy of the good cheer and reception which Abraham gave at the weaning of his son, would seek here and in every Scripture food which is different, I think, from that which is meat, indeed, but is not solid food, and from what are figuratively called herbs, which are food to one who has been weaned and is not yet strong but weak, according to the saying, "He that is weak eateth herbs."[206]

14:3 - Let not him that eats despise him that eats not; and let not him which eats not judge him that eats: for God has received him.

Clement of Alexandria The Instructor Book II
"Let him who eateth, not despise him who eateth not; and let him who eateth not, not judge him who eateth."[26]
Clement of Alexandria Stromata Book III
"Qui" itaque "non comedit, comedentem ne spernat. Qui autem comedit, eum qui non comedit non judicet: Deus enim ipsum accepit."[71]

14:6 - He that regards the day, regards it unto the Lord; and he that regards not the day, to the Lord he does not regard it. He that eats, eats to the Lord, for he gives God thanks; and he that eats not, to the Lord he eats not, and gives God thanks.

Clement of Alexandria The Instructor Book II
And a little way on he explains the reason of the command, when he says, "He that eateth, eateth to the Lord, and giveth God thanks; and he that eateth not, to the Lord he eateth not, and giveth God thanks."[27]

14:9 - In order to this end Christ both died, and rose, and revived, that he might be Lord both of the dead and living.

Irenaeus Against Heresies Book III
And he renders the reason why the Son of God did these things, saying, "For to this end Christ both lived, and died, and revived, that He might rule over the living and the dead."[328]
Methodius From the Discourse on the Resurrection
The saint says at the end: The words, "For to this end Christ both died, and rose, and revived, that He might be Lord both of the dead and living,"[119]

14:10 - But why do you judge your brother? or why do you set at nothing your brother? for we shall all stand before the judgment seat of Christ.

Epistle of Polycarp to the Philippians
for we are before the eyes of our Lord and God, and "we must all appear at the judgment-seat of Christ, and must every one give an account of himself."[40]

14:12 - So then every one of us shall give account of himself to God.

Cyprian Epistle LXXV
I have replied, dearest son, to your letter, so far as my poor ability prevailed; and I have shown, as far as I could, what I think; prescribing to no one, so as to prevent any prelate from determining what he thinks right, as he shall give an account of his own doings to the Lord, according to what the blessed Apostle Paul in his Epistle to the Romans writes and says: "Every one of us shall give account for himself: let us not therefore judge one another."[37]

14:13 - Let us not therefore judge one another any more: but judge this rather, that no man put a stumbling block or an occasion to fall in his brother's way.

Tertullian To His Wife Book II
marriages, put "an occasion of falling"[3]

14:14 - I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteems any thing to be unclean, to him it is unclean.

Arnobius Against the Heathen Book VII
sucklings that he may digest them more speedily?[91]

14:15 - But if your brother be grieved with your food, now walk you not charitably. Destroy not him with your food, for whom Christ died.

Irenaeus Against Heresies Book III
" And everywhere, when [referring to] the passion of our Lord, and to His human nature, and His subjection to death, he employs the name of Christ, as in that passage: "Destroy not him with thy meat for whom Christ died."[335]
A Letter from Origen to Africanus
we notice such things, we are forthwith to reject as spurious the copies in use in our Churches, and enjoin the brotherhood to put away the sacred books current among them, and to coax the Jews, and persuade them to give us copies which shall be untampered with, and free from forgery! Are we to suppose that that Providence which in the sacred Scriptures has ministered to the edification of all the Churches of Christ, had no thought for those bought with a price, for whom Christ died;[4]
Origen Against Celsus Book VIII
and again, "Destroy not him with thy meat, for whom Christ died; "[55]
The Second Epistle of Clement Concerning Virginity
For "if for the sake of meat our brother be made sad, or shocked, or made weak, or caused to stumble, we are not walking in the love of God. For the sake of meat thou causest him to perish for whose sake Christ died."[23]

14:16 - Let not then your good be evil spoken of:

Clement of Alexandria The Instructor Book II
"Let not, then, your good be evil spoken of; for the kingdom of God is not meat and drink," says the apostle, in order that the meal spoken of may not be conceived as ephemeral, "but righteousness, and peace, and joy in the Holy Ghost."[12]

14:17 - For the kingdom of God is not food and drink; but righteousness, and peace, and joy in the Holy Spirit.

Clement of Alexandria Stromata Book III
Atqui hic ipse exclamavit: "Non est regnum Dei esca et potus: "neque vero abstinentia a vino et carnibus; "sed justitia, et pax, et gaudium in Spiritu sancto."[76]
Tertullian On Prayer
nor a sad by a joyful,[80]
Tertullian On Fasting
And if he has "delivered you the keys of the meat-market," permitting the eating of "all things" with a view to establishing the exception of" things offered to idols; "still he has not included the kingdom of God in the meat-market: "For," he says, "the kingdom of God is neither meat nor drink; "[103]
Cyprian Treatise XII Three Books of Testimonies Against the Jews
Also to the Romans: "The kingdom of God is not meat and drink, but righteousness, and peace, and joy in the Holy Ghost."[688]
Novation On the Jewish Meats
The apostle cries out: "The kingdom of God is not meat and drink, but righteousness, and peace. and joy."[25]

14:19 - Let us therefore follow after the things which make for peace, and things wherewith one may edify another.

Clement of Alexandria Stromata Book III
Sed et qui utitur, "cum gratiarum actione,"[152]

14:20 - For food destroy not the work of God. All things indeed are pure; but it is evil for that man who eats with offence.

Clement of Alexandria The Instructor Book II
Only let him partake temperately, not dependent on them, nor gaping after fine fare. For a voice will whisper to him, saying, "Destroy not the work of God for the sake of food."[33]
Tertullian On Fasting
a home-thrust, detractors as you are of this observance: "Do not for the sake of food," he says, "undo[101]
Didache
bear what thou art able; but against that which is sacrificed to idols[71]

14:21 - It is good neither to eat flesh, nor to drink wine, nor any thing whereby your brother stumbles, or is offended, or is made weak.

Clement of Alexandria The Instructor Book II
neither in discourse or food are we to join, looking with suspicion on the pollution thence proceeding, as on the tables of the demons. "It is good, then, neither to eat flesh nor to drink wine,"[32]
Clement of Alexandria Stromata Book III
Scriptum est enim: "Bonum est carnero non coinedere, nec vinum bibere, si quis comedat per offendiculum."[150]
Origen Against Celsus Book VIII
We do not indeed deny that the divine word does seem to command something similar to this, when to raise us to a higher and purer life it says, "It is good neither to eat flesh, nor to drink wine, nor anything whereby thy brother stumbleth, or is offended, or is made weak; "[54]

14:23 - And he that doubts is damned if he eat, because he eats not of faith: for whatsoever is not of faith is sin.

Dionysius Extant Fragments Part I
in this matter or not. And he that doubteth in the matter of meats, the apostle tells us, "is damned if he eat."[164]
Origen Commentary on Matthew Book XI
And the saying is I think, not to be despised, and on this account, demands clear exposition, which seems to me to be thus; as it is not the meat but the conscience of him who eats with doubt which defiles him that eateth, for "he that doubteth is condemned if he eat, because he eateth not of faith,"[136]