When my students are feeling discouraged because they are struggling with a particular lesson and they become very doubtful of their ability to perform and they start using language like, "I can't do this," I call that "stinkin thinking." I tell my students, "No stinkin thinkin in this classroom - I don't want to hear, 'I can't do this' I want to hear, "I am currently working on mastering....(then whatever it is they are struggling with). They always laugh at first, but I find it amazing how it always seems to change their attitude. Their body language also changes as they say the new "verse."