Nicks Cardinal Virture

At the end of the chapter, we learn that Nick's cardinal virtue is " I am one of the few honest people that I have ever know". I feel like Nick feels this way because he surrounds himself with people who start rumors or pretend to be someone their not. I feel Nick is being humble about his idea. Nick is not going around telling people that they're dishonest to him. He is keeping this as a note for himself.