"Give us this day our daily bread" (Matt. 6:11).
God gives us what we need one day at a time. He is determined to teach us trust. He calls us to trust that He will provide again tomorrow as He did today.
In the Old Testament He instructed the Israelites to gather just enough manna for the day. He sent it again the next morning. In the New Testament, in which we live, He teaches us to pray, "Give us this day our daily bread." In other words, just enough strength for today. He will supply it again tomorrow.
All of this leads to two definitions:
Anxiety = looking at tomorrow's challenges without tomorrow's strength.
Trust = knowing that tomorrow's strength will be a match for tomorrow's challenges.
You are not yet in possession of tomorrow's strength. It will be yours tomorrow morning, but not before. You are given strength for today, bright hope for tomorrow, and the most blessed of all things: trust in your heavenly Father.