Good article about the downside of praise.
...When we do well in school and are told that we are "so smart," "so clever," or "such a good student," this kind of praise implies that traits like smartness, cleverness, and goodness are qualities you either have or you don't. The net result: when learning something new is truly difficult, smart-praise kids take it as sign that they aren't "good" and "smart," rather than as a sign to pay attention and try harder...