Isaiah 26:3

You will keep in perfect and constant peace the one whose mind is steadfast (that is, committed and focused on You-in both inclination and character), because he trusts and takes refuge in You (with hope and confident expectation).

Stress and worry focus more on the problem than the solution. When we focus on Jesus as our provider and answer, we remove ourselves from the situation. We shift the problem to Jesus in faith that He will help us, and as we use our faith, peace will come to our hearts and minds.