Nicholas is a man whom the local college students all think of as eccentric. Each day he stands on campus, smiling at people as they walk by, and he is known for his ever-present greeting of "Good luck!" In fact, the students at this campus have come to refer to him as "Good Luck Nick." Nobody knows if he has a home or if he is destitute, but Nicholas never asks for anything. Which of the four criteria of mental illness might Nicholas satisfy