You keep him in perfect peace,
whose mind is stayed on You,
because he trusts in You.
Trust in the LORD for ever,
for the LORD is an everlasting rock.

                         Isaiah 26. 3-4

(Trust in God produces
     a peace that should not
     even be able to exist,
a peace not reliant
      on the shifting sands of circumstances,
   but rooted firmly in Him alone.)