Nothing is foolproof to a sufficiently talented fool. Its better to keep one's mouth shut and appear stupid than open in and remove all doubts. If you can't convince them, confuse them. If you can't beat them, arrange to have them beaten. Pride is what we have.
Vanity is what others have.
Some people are alive only because it's illegal to kill them. You never really learn to swear until you learn to drive. Seen it all, done it all, can't remember most of it. We all have a photographic memory. Some don't just have film.