If a jewel falls into the mire, it remains as precious as befour; and though dust should ascend to heaven, its former worthlessness will not be altered.
宝石及时落在泥潭里，仍是一样可贵；尘土纵然扬到天上，还是没有价值。
There is no royal road to science, and only those who do not dread the fatiguing climb of its steep path have a chance of gaining its luminous summit.
在科学上没有平坦大道，只有不畏劳苦沿着崎岖之路攀登的人，才有希望大道光辉的顶点。