Why has slamming a ball with a racquet become so obsessive a pleasure for so many of us? It seems clear to me that a primary attraction of the sport is the opportunity it gives to release aggression physically without being arrested for felonious assault. – Nat Hentoff
Our problem, from the point of view of psychology and from the point of view of genetic epistemology, is to explain how the transition is made from a lower level of knowledge to a level that is judged to be higher. – Jean Piaget
