Another parable put he forth unto them, saying,
The kingdom of heaven is like to a grain of mustard seed, which a man took, and sowed in his field:
All Commentaries on Matthew 13:31 Go To Matthew 13
John Chrysostom
AD 407
That is, since He had said, that of the crop three parts are lost, and but one saved, and in the very part again which is saved so great damage ensues; lest they should say, And who, and how many will be the faithful? this fear again He removes, by the parable of the mustard seed leading them on to belief, and signifying that in any case the gospel shall be spread abroad.