Which indeed is the least of all seeds: but when it is grown, it is the greatest among herbs, and becomes a tree, so that the birds of the air come and lodge in the branches thereof.
All Commentaries on Matthew 13:32 Go To Matthew 13
Theophylact of Ochrid
AD 1107
. The grain of mustard seed is both the preaching and the apostles. For though they appeared to be few, they encompassed the whole earth, with the result that the birds of the air, that is, those with frivolous and feathery knowledge of the things above, could find rest in them. You, too, O reader, must be as a grain of mustard seed, small in appearance (for it is not right to make a show of virtue) but hot, zealous, pungent, and reproving. Thus you will become greater than the shrubs, that is, greater than those who are weak and imperfect, by yourself being perfect, so that even the winged creatures of heaven, that is, the angels, will take their rest in you who are living the angelic life. For they, too, rejoice in the righteous.