The only limit to our realization of tomorrow will be our doubts of today.

The more the division of labor and the application of machinery extend, the more does competition extend among the workers, the more do their wages shrink together.

艺术不是反映现实的镜子，而是塑造现实的锤子。

引力解释了行星的运动，但它不能解释谁让行星运动。