When you sell in desperation, you always sell cheap. - Peter Lynch

The trick is not to learn to trust your gut feelings, but rather to discipline yourself to ignore them. Stand by your stocks as long as the fundamental story of the company hasn’t changed.

If you don't understand a company, if you can't explain it to a ten-year-old in 2 minutes or less, don't own it.

This is one of the keys to successful investing: focus on the companies, not on the stocks.