If a dog jumps into your lap, it is because he is fond of you; but if a cat does the same thing, it is because your lap is warmer.
Alfred North WhiteheadInventive genius requires pleasurable mental activity as a condition for its vigorous exercise
Alfred North WhiteheadI am sure that one secret of a successful teacher is that he has formulated quite clearly in his mind what the pupil has got to know in precise fashion. He will then cease from half-hearted attempts to worry his pupils with memorizing a lot of irrelevant stuff of inferior importance.
Alfred North Whitehead