Isaiah 26:3, 4

3 ^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.

4 ^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].