“Is ‘aggression’ about thought, emotion, or something done with muscles?”

— Robert M. Sapolsky, Behave: The Biology of Humans at Our Best and Worst

“Can you ever separate doing good from the expectation of reciprocity, public acclaim, self-esteem, or the promise of paradise?”

— Robert M. Sapolsky, Behave: The Biology of Humans at Our Best and Worst