Expositor's Bible Commentary Commentary Matthew 6:34

"Be not therefore anxious for the morrow: for the morrow will be anxious for itself. Sufficient unto the day is the evil thereof." — Matthew 6:34 (ASV)

Worry over tomorrow’s misfortunes is nonsensical, because today has enough to occupy our attention and because tomorrow’s feared misfortunes may never happen. Furthermore, today’s grace is sufficient only for today and should not be wasted on tomorrow. If tomorrow does bring new trouble, there will be new grace to meet it.