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:
Read Chapter 13
Hilary of Poitiers
AD 368
The Lord compared his reign with a grain of mustard seed, which is very pungent and the smallest of all seeds. Its inherent potency is heightened under stress and pressure. Therefore, after this grain is sown in the field— that is, when it has been seized by someone and delivered up to death as though buried in the field by a sowing of its body—it grows up to become larger than any herb and surpasses all the glory of the prophets.
The man who sows in his field is interpreted by many as the Savior. He sows in the souls of believers. By others he is interpreted as one who sows in his field—that is to say, in himself and in his heart. Who is it that sows if not our mind and heart? They take up the grain of preaching and nurture the plant with the moisture of faith, making it sprout and shoot up in the field of the heart. The preaching of faith in the gospel appears to be least among all tasks. Indeed, anyone who preaches the Godman of truth, Christ who died, and the stumbling block of the cross may not think immediately of mere faith as the primary doctrine. Put this particular doctrine side by side with the teachings of the philosophers, their books, their splendid eloquence and fine discourses, and you will see just how small it is compared with the other seeds of the gospel plant. When those teachings grow, they have nothing to show that is pungent or vigorous or vital. Everything turns out weak and withering in...
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.
