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).

When we focus on God’s word, we will learn about His character and promises. We lack peace without the knowledge of these promises because we don’t know what is ours through Jesus. Our refuge and safety are in the Lord when we have faith in the word.