I reminded him that despite his apparent successes, such as graduating high school, preparing to go to college, finding a job he enjoys, having a small circle of reliable friends, as well as loving parents who believe in him, he would still fall prey to those self-sabotaging thoughts.
It made sense to him to treat these thoughts one at a time, like a line of individuals waiting for customer service. He agreed to run each one through validation filters. Was it true and knowable that he would fail? Of course not. Was it true nothing would ever work? No, he had successes that proved otherwise. And yes, sometimes things do fall apart, but then much of the time they can be put back together. He recognized that he was not Humpty Dumpty.
Neither am I. Not sitting on a wall, afraid of toppling off.