Isaiah 26:3,4 ~ The Amplified Bible
You will guard him and keep him in perfect and constant peace whose mind [both its inclination and its character] is stayed on You, because he commits himself to You, leans on You, and hopes confidently in You. So trust in the Lord (commit yourself to Him, lean on Him, hope confidently in Him) forever; for the Lord God is an everlasting Rock (the Rock of Ages)