I Peter 5:6-7
6 Humble yourselves therefore under the mighty hand of God, that he may exalt you in due time:
7 Casting all your care upon him; for he careth for you.
We are to cast all of our care upon God. Any and all anxieties that come into our mind, we are not to carry them around and be weighed down by them, but instead we should cast all of them on God. Then we can be light-hearted and at peace.
Psalm 55:22
Cast thy burden upon the LORD, and he shall sustain thee: he shall never suffer the righteous to be moved.
As we cast our burdens on God, He will sustain us.