Success is the sum of small efforts, repeated day in and day out.
"I'm interested in the human condition and what makes people tick."
凡是能够说的，都能够说清楚；对于不可说的东西我们必须保持沉默。
The value of a commodity, or the quantity of any other commodity for which it will exchange, depends on the relative quantity of labor which is necessary for its production, and not on the greater or less compensation which is paid for that labor.