The title of Grant Stevens’s latest solo show, “You have within you right now everything you need to succeed,” has a familiar ring at a time when self-optimization and positive thinking have become de rigueur in the pursuit of life mastery. Since the early 2000s, the artist has explored images, sounds, and texts of media culture and the internet like a sociologist unable to disentangle himself from the phenomena he scrutinizes. Believing collage to be one of the most significant legacies of modernism, Stevens updates this technique, along with appropriation and quotation, in works focused on