理论物理对于实验物理学家，就像和声理论对于作曲家一样。
城市从不沉睡，它的黑暗也是如此。
The study of cognition requires both empirical and theoretical approaches.
The best moments in our lives are not the passive, receptive, relaxing times… The best moments usually occur if a person’s body or mind is stretched to its limits in a voluntary effort to accomplish something difficult and worthwhile.