The Merriam-Webster Word of the Day for July 7th was diurnal.
Here is the definition:
1 : recurring every day 2 : of, relating to, or occurring in the daytime
Here are a few passages that come to mind:
Do not boast about tomorrow, For you do not know what a day may bring forth. - Proverbs 27:1
So do not worry about tomorrow; for tomorrow will care for itself. Each day has enough trouble of its own. - Matthew 6:34