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历史学家必须兼具诗人和哲学家的特质。
The art of teaching consists in large part of the ability to awaken the natural curiosity of young minds and to satisfy it with the nourishment of knowledge.
Psychology must be independent of philosophy and physiology.
The more constraints you have, the more creative you become.
The only thing we can know is that we know nothing and that is the highest flight of human wisdom.