The moment you think you know it all is the moment you have the most to learn.

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.

If there's a book that you want to read, but it hasn't been written yet, then you must write it.