Investor Nick Murray once said, "Timing the market is a fool's game, whereas time in the market is your greatest natural advantage." Remember this the next time you're compelled to cash out.
Definitely. In fact, a growing body of research is finding that chasing returns is a killer for many investors.
This is also misconception no. 8 from from Chapter 1 in Chuck Price's book Investing Simplified: What You Don't Know Can Hurt You.