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(shí)落在泥潭里，仍是一樣可貴；塵土縱然揚(yáng)到天上，還是沒(méi)有價(jià)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(méi)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(diǎn)。