Catena Aurea on Matthew 6:31–33: Augustine of Hippo

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.