The will to learn is an intrinsic motive, one that finds both its source and its reward in its own exercise.
学习的意愿是一种内在动机，其来源和奖励都在于其自身的实践。
忧虑是人们生存的重要条件。与忧虑的正面交锋可以为我们驱赶厌倦感，使我们的感觉更加敏锐，并且保持人类生存所必须的压力。
The mathematician's patterns, like the painter's or the poet's, must be beautiful; the ideas, like the colors or the words, must fit together in a harmonious way.
