I know of no more encouraging fact than the unquestionable ability of man to elevate his life by conscious endeavor.

I know of no more encouraging fact than the unquestionable ability of man to elevate his life by conscious endeavor.

我所知道的最令人鼓舞的事实莫过于人类通过有意识的努力来提高自己的生活水平的无可置疑的能力。

-- Henry David Thoreau 亨利·大卫·梭罗