Conviction.
assurance · bourrage · certitude · conviction · croyance · insinuation · inspiration · propagande · suggestion · éloquence
ETYM Latin persuasio. Related to French persuasion.
1. Changing a person's beliefs by argument or reasoning or entreaty.
2. Inducement by argument or reasoning or entreaty.
3. The act of persuading (or attempting to persuade); SYN. suasion.