18 If only you had paid attention to my commands, your peace would have been like a river, your well-being like the waves of the sea.

Read Isaiah 48:18 Using Other Translations

O that thou hadst hearkened to my commandments! then had thy peace been as a river, and thy righteousness as the waves of the sea:
Oh that you had paid attention to my commandments! Then your peace would have been like a river, and your righteousness like the waves of the sea;
Oh, that you had listened to my commands! Then you would have had peace flowing like a gentle river and righteousness rolling over you like waves in the sea.