One could make quite a study of the common cheats of mankind.

And if the common cheater were to read it, he might be surprised to learn that he is not nearly the sophisticated thinker he thinks he is.

Meanwhile, the uncommon cheater would find it quite the playbook.

But if a penitent soul should read it, he would melt at his deep corruption and change his ways, spending the rest of his life training himself not to cheat anymore.