Theophylact of Ohrid
Catena Aurea · Markusevangelium 4
And he said, Whereunto shall we liken the kingdom of God? or with what comparison shall we compare it? It is like a grain of mustard seed, which, when it is sown in the earth, is less than all the seeds that be in the earth: But when it is sown, it groweth up, and becometh greater than all herbs, and shooteth out great branches; so that the fowls of the air may lodge under the shadow of it. And with many such parables spake he the word unto them, as they were able to hear it. But without a parable spake he not unto them: and when they were alone, he expounded all things to his disciples.
Most brief indeed is the word of faith; Believe in God, and thou shalt be saved. But the preaching of it has been spread far and wide over the earth, and increased so, that the birds of heaven, that is, contemplative men, sublime in understanding and knowledge, dwell under it. For how many wise men among the Gentiles, quitting their wisdom, have found rest in the preaching of the Gospel! Its preaching then is greater than all.