The only meaningful way to study learning is through objective measurement.

种荆棘会得到刺，种桃李会得到树荫。比喻善恶有报

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.

Language is both a bridge and a barrier.

"History remembers the dates, but biography remembers the days."