First, rephrasing the "It's too hard, I can't do this," is NOT about discounting a student's feelings. Learning is hard! It means spending time problem solving a new task in order to gain ownership over that task. It means expanding your comfort zone, which, by definition, is uncomfortable. The important Diamond Distinction is in the second part of the statement "I can't do this." For me, it's about reframing their inner conversation (which they usually declare in an "outside voice!") so that it is not a stop light of them questioning their own potential. Most students do not readily recognize that everything they ever learned had to pass through the "new" stage before mastery occurred. Walking, riding a bike, tying their shoes, using utensils to eat, etc. All of it was new at one point. A reframing helps calm the panic.