Matthew 13:31

Clement of Alexandria The Instructor Book I

Wherefore He Himself, declaring Himself very beautifully, likened Himself to a grain of mustard-seed;[257]

Tertullian An Answer to the Jews

the Fashioner of humanity, the Sower[15]

Hippolytus Refutation of All Heresies Book V

That which is, he says, nothing, and which consists of nothing, inasmuch as it is indivisible-(I mean) a point-will become through its own reflective power a certain incomprehensible magnitude. This, he says, is the kingdom of heaven, the grain of mustard seed,[124]

Constitutions of the Holy Apostles Book III

But of the remaining doctrines let her not answer anything rashly, lest by saying anything unlearnedly she should make the word to be blasphemed. For the Lord has taught us that the word is like "a grain of mustard seed,"[17]

Origen Commentary on Matthew Book XIII

removes not one mountain only, but also several analogous to it; for although faith is despised by men and appears to be something very little and contemptible; yet when it meets with good ground, that is the soul, which is able fittingly to receive such seed, it becomes a great tree, so that no one of those things which have no wings, but the birds of heaven which are winged spiritually, are able to lodge in the branches of faith so great.[47]