Worry is not a trivial sin because it strikes a blow both at God’s love and integrity. Worry declares our heavenly Father to be untrustworthy in His Word and His promises. To claim belief in the inerrancy of Scripture yet in the next moment express worry is to deny that very belief. Worry reveals that we are mastered by our circumstances and by our own finite perspective and understanding rather than God’s Word. Worry is therefore not only debilitating and destructive but also maligns and impugns God.

 John MacArthur, Daily Readings from the Life of Christ, (Chicago: Moody Publishers, 2008), 172.