Cyril of Alexandria
Catena Aurea · Lukasevangelium 12
Consider the lilies how they grow: they toil not, they spin not; and yet I say unto you, that Solomon in all his glory was not arrayed like one of these. If then God so clothe the grass, which is to day in the field, and to morrow is cast into the oven; how much more will he clothe you, O ye of little faith? And seek not ye what ye shall eat, or what ye shall drink, neither be ye of doubtful mind. For all these things do the nations of the world seek after: and your Father knoweth that ye have need of these things. But rather seek ye the kingdom of God; and all these things shall be added unto you.
it were strange for the disciples, who ought to set before others the rule and pattern of life, to fall into those things, which it was their duty to advise men to renounce; and therefore our Lord adds, And seek not what, ye shall eat, &c. Herein also our Lord strongly recommends the study of holy preaching, bidding His disciples to cast away all human cares.