Take therefore no thought for tomorrow: for tomorrow shall take thought of the things for itself. Sufficient unto the day is the evil thereof.
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Augustine of Hippo
Serm. in Mont., ii, 17: But when we read that the Apostle suffered hunger and thirst, let us not think that God’s promises failed him; for these things are rather aids. That Physician to whom we have entirely entrusted ourselves, knows when He will give and when He will withhold, as He judges most for our advantage. So that should these things ever be lacking to us, (as God to exercise us often permits,) it will not weaken our fixed purpose, but rather confirm it when wavering.
Or otherwise; Tomorrow is said only of time where future succeeds to past. When then we work any good work, we think not of earthly but of heavenly things. “The morrow shall be anxious for itself,” that is, Take food and the like, when you ought to take it, that is when necessity begins to call for it.But herein we must be careful, that, whenwe see any servant of God endeavouring to provide necessaries either for himself, or those committed to his care, we do not straight judge him to sin against this command of the Lord in being anxious for the morrow. For the Lord Himself, to whom Angels ministered, thought good to carry a bag for example sake. And in the Acts of the Apostles it is written, that food necessary for life was provided for future time, at a time when famine threatened. What the Lord condemns therefore, is not the provision of these things after the manner of men, but if a man because of these things does not fight as God’s soldier.