"The highest possible achievement is to be happy."

"I did not attack 'free will.' I attacked a traditional concept of 'free will' which is no longer tenable."

"I did not direct my life. I didn't design it. I never made decisions. Things always came up and made them for me. That's what life is."

"I could make a pigeon a high achiever by reinforcing it on a proper schedule."

"I am not an atheist; I am a behaviorist."