目的赋予心理活动意义。

Efficiency in grain production isn't an option—it's a necessity.

至今一切社会的历史都是阶级斗争的历史。

想走得快，独自前行；想走得远，结伴同行。

The market is a pendulum that forever swings between unsustainable optimism (which makes stocks too expensive) and unjustified pessimism (which makes them too cheap). The intelligent investor is a realist who sells to optimists and buys from pessimists.