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.
寶石及時落在泥潭里，仍是一樣可貴；塵土縱然揚到天上，還是沒有價值。
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.
在科學(xué)上沒有平坦大道，只有不畏勞苦沿著崎嶇之路攀登的人，才有希望大道光輝的頂點。