John Chrysostom
As our Lord had before given instruction about food, so now also about raiment, saying, Consider the lilies of the field how they grow; they toil not, neither do they spin, that is, to make themselves clothing. Now as above when our Lord said, the birds sow not, He did not reprove sowing, but all superfluous trouble; so when He said, They toil not, neither do they spin, He does not put an end to work, but to all anxiety about it.
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.
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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.
He said not “God,” but your Father, to incite them to greater confidence. For who is a father, and would not allow the want of his children to be supplied? But He adds another thing also; for you could not say that He is indeed a father, yet knoweth not that we are in need of these things. For He who has created our nature, knoweth its wants.
Now Christ promises not only a kingdom, but also riches with it; for if we rescue from cares those who neglecting their own concerns are diligent about ours, much more will God.