“The proper study of Mankind is Everything.”
“The proper study of mankind is...books.”
“Know thyself, presume not God to scan;The proper study of mankind is man.”
“Oh! A mystery is it?' I cried, rubbing my hands. 'This is very piquant. I am much obliged to you for bringing us together. "The proper study of mankind is man" you know”
“The noblest study of mankind is Man, says Man.”
“Human relations is the study of mankind, with the purpose of revealing and removing the basic causes of conflicts among men.”