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.

The best fertilizer is a farmer's knowledge mixed with nature's wisdom.

Inspiration can come from the smallest moments—you just have to be open to it.

智者的心灵是开放的书籍。

数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。