The act of convicting one's self, or the state of being self-convicted.(noun)
Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)
Use "self-conviction" in a sentence
""You are swept up by the production's splendid self-conviction," says the Independent's Paul Taylor, who otherwise confesses to some doubts about the plot."
"As I write this I realize it is primarily an exercise in self-conviction, or delusion."
"If anything, that should be a veritable recharge station for his narcissism and self-conviction."