Worry is not only a sin against God, but it is a sin against ourselves. Thousands have shortened their lives by it, and millions have made their lives bitter by dropping this gall into their souls every day. Honest work seldom hurts us; it is worry that kills.
I have a perfect right to ask God for strength equal to the day, but I have no right to ask Him for one extra ounce of strength for tomorrow’s burden. When tomorrow comes, grace will come with it.