more about battling anxiety

People are so committed to worrying that, if they can’t find anything in the present to worry about, they think about possible problems in the future. So Jesus assures us, “Tomorrow will care for itself.” This is not the careless philosophy of the hedonist who lives only for his present enjoyment. It is the conviction of the child of God who knows tomorrow will care for itself because it is in his heavenly Father’s hands.

“Each day has enough trouble of its own” is not a call to worry about that trouble—it’s an invitation to concentrate on meeting the temptations, trials, opportunities, and struggles we have today, relying on our Father to protect and provide as we have need. There is enough trouble in each day without adding the distress of worry to it.

God promises His grace for tomorrow and for every day thereafter and through eternity. But He does not give us grace for tomorrow now—He gives His grace only a day at a time as it is needed, not as it may be anticipated.

John Macarthur, Daily Readings from the Life of Christ.