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.

智慧之鸟的猫头鹰，在文明的暮色中才开始起飞。

Symmetry is a complexity-reducing concept (co-routines include subroutines); seek it everywhere.