Cast your burden on the Lord, and He shall sustain you. Psalm 55:22
Some things in life cannot be changed and some can. Some things God has given to us as fixed realities that we must accept. And some things He would have us not accept, but (with His help) work to change. If we fail to do both of these to accept some things and to change others we will end up burdened with worry, undeserved guilt, and frustration.
Worry is the interest paid on trouble before it comes due. Instead, God would have us learn to trust Him. "Cast your burden on the Lord, and He shall sustain you."