我不断看到有些人在生活中越过越好，他们不是最聪明的，甚至不是最勤奋的，但他们是学习机器。他们每天夜里睡觉时都比那天早晨聪明一点点。
I constantly see people rise in life who are not the smartest, sometimes not even the most diligent, but they are learning machines. They go to bed every night a little wiser than they were when they got up.
蓬草长在麻地里，不用扶持也能挺立住；白沙混进了黑土里，就会变得和土一样黑。