Matthew 6:34, KJV, ASV "Sufficient unto the day . . ."
Picture of Jesus of Nazareth (6th Century Mosaic)
My favorite biblical quote is from Matthew 6:34
". . . Sufficient unto the day is the evil thereof."
This is attributed by Matthew to Jesus of Nazareth and is part of the Sermon on the Mount.
I have had my share of evil days. It is helpful to forget whatever evils were done to me the day before. It is better not to fret over the evils that will be done to me or that I must do on a future day.
It is best to worry only about the day at hand. But, the way it is phrased in the book of Matthew is a much better way to say it than, for instance: "just worry about one day at a time".
When phrased ". . . sufficient unto the day is the evil thereof . . ." the thought is as much a warning not to borrow trouble, or to start or perpetuate a vendetta, as it is kindly advice to limit the amount of things one is worried by.