YOU   CAN

DO   IT!!!

You teach your class a new skill and you hear a student say, "I cannot do this it is too hard."  "Yes, you can and you will learn it perhaps not today but it will make sense to you soon."  Have your student express all of the things that they can do.  Then ask them if they were all easy to learn.  They will be able to see all of things they are  capable of doing and how some of them might have been challenging to learn, but they did eventually understand them.  Always have them be aware of all of the positives and not to concentrate on the negatives.