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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Theophylact of Ochrid
. "The evil of the day" means the crushing burden and pressure. It is sufficient for you that you are afflicted by today’s burden. If you also take thought for tomorrow, and continually burden yourself for the sake of bodily things, when will you have time for God?