If you think the market’s 'too high' wait 'til you see it 20 years from now.
Wealth is not determined by investment performance, but by investor behavior.
Investment performance doesn't determine real-life returns; investor behavior does.
Timing the market is a fools game, whereas time in the market is your greatest natural advantage.
Surprise is the mother of panic.
Long-term investment success is almost totally a function of how one emotionally handles declines in the equity market, as opposed to how one's portfolio handles them.