Language is the only instrument of science，and words are but the signs of ideas.—Samuel Johnson
语言是科学的唯一工具，而词则是思想的符号。
——塞缪尔·约翰逊
Language is the amber in which a thousand precious and subtle thoughts have been safely embedded and preserved.—Richard C．Trench
语言是孕育着千百种宝贵和微妙思想的琥珀。
——理查德C.特伦奇
Languages are to be learned only by reading and talking，and not by scraps of authors got by heart.—John Locke
语言只有通过读和说才能学会，决不是仅凭记住一些作家的只言片语。 ——约翰·洛克
