John Chrysostom — as excerpted in the Catena Aurea on Luke 12:27-31

“(Hom. 22. in Matt.) He does not here employ the example of the birds, making mention of a swan or a peacock, but the lilies, for he wishes to give force to the argument on both sides, that is to say, both from the meanness of the things which have obtained such honour, and from the excellence of the honour conferred upon them; and hence a little after He does not call them lilies, but grass, as it is added, If then God so clothe the grass, which to-day is, He says not, which to-morrow is not, but to-morrow is cast into the oven; nor does He say simply, God clothe, but He says, God so clothe, which has much meaning, and adds, how much more you, which expresses His estimation and care of the human race. Lastly, when it behoves Him to find fault, He deals here also with mildness, reproving them not for unbelief, but for littleness of faith, adding, O ye of little faith, that He may so the more rouse us up to believe in His words, that we should not only take no thought about our apparel, but not even admire elegance in dress.”