Aperson in an episode of mania can believe that she is destined for greatness or is exceptionally gifted, beliefs that are artifacts of increased mood. these types of beliefs are known as:

These types of beliefs are "delusions".

A delusion is a conviction that is unmistakably false and that shows a variation from the norm in the influenced individual's substance of thought. The false conviction isn't represented by the individual's social or religious foundation or his or her level of knowledge. The key component of a delusion is how much the individual is persuaded that the conviction is valid.