We admire people with the courage of their convictions, those who know their own minds and don’t waver. It’s a good thing to be called tenacious, persistent, tough, steady or steadfast. A good thing, that is, if you’re not a growth stock investor. The rules say that growth investors should stick with a winning stock for as long as it rises. The problem comes when a stock starts to lose value but the investor has faith in the stock and demonstrates that conviction by holding it all the way to financial disaster.