Six times within this psalm this phrase is repeated almost directly. Six times we're told that in the midst of pain, hunger, stormy destruction, wandering in wastelands, distress and darkness, rebellion, distance from God in our souls, etc...Six times we're reminded that in these conditions His love is yet unfailing and eternal.
His wonders are apparent in the sand and the trees and your children and the existance of, awareness of and desire for...love. His love endures forever - Let the redeemed of the Lord say so!