Matthew 17:20

Clement of Alexandria Stromata Book II

And faith is a power of God, being the strength of the truth. For example, it is said, "If ye have faith as a grain of mustard, ye shall remove the mountain."[109]

Clement of Alexandria Stromata Book V

Such were the apostles, in whose case it is said that "faith removed mountains and transplanted trees."[8]

Cyprian Treatise XII Three Books of Testimonies Against the Jews

Also in the same place: "If you have faith as a grain of mustard seed, ye shall say to this mountain, Pass over from here to that place, and it shall pass over; and nothing shall be impossible unto you."[603]

Recognitions of Clement V

For thus the true Prophet promised us, saying, `Verily I say to you, that if ye have faith as a grain of mustard seed, ye shall say to this mountain, Remove hence, and it shall remove.'[2]

Recognitions of Clement V

He is the true worshipper of God, who not only is himself free from passions, but also sets others free from them; though they be so heavy that they are like mountains, he removes them by means of the faith with which he believes in God. Yea, by faith be truly removes mountains with their trees, if it be necessary.[21]

Clementine Homily XI

For the Jew believes God and keeps the law, by which faith he removes also other sufferings, though like mountains and heavy.[5]

Origen Commentary on Matthew Book X

And the Saviour, acknowledging the method of healing, says, "Who touched Me? For I perceived that power went forth from Me."[132]

Origen Commentary on Matthew Book XIII

for he, who has all faith, which is as a grain of mustard seed,[46]

Origen Commentary on Matthew Book XIII

But of the whole race of men on earth, I think, being oppressed by reason of their wickedness and His tarrying with them, the Saviour said, "How long shall I be with you? "We have already, then, spoken in part of the words, "If ye have faith as a grain of mustard seed, ye shall say unto this mountain,"[54]

Origen Commentary on Matthew Book XIII

for not one mountain merely, but also several analogous to it, he removes who has all faith which is as a grain of mustard-seed; and nothing shall be impossible to him who has so great faith.[56]