Merriam's Laws

The four laws of anthropology: 

1. People are disappointing
2. People don't know anything
3. People are dangerous
4. Etiquette is overrated

Should you forget any of the particulars of the above laws, the first says it all, really. And it should go without saying that neither any group of people not anyone, including the anthropologist who discovered these laws, possesses anything in their character to exempt them from these laws. Still, they describe not the human soul, but human behavior.