Theophylact of Ohrid — as excerpted in the Catena Aurea on Mark 4:30-34

“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.”