You can’t live on paper profits. But when you’re holding a position that has done everything you expected—and more—it’s very easy to get greedy. You start thinking, "Sure, I’m in the money a couple of grand, but it could go higher." So you hold on, long after the signs have started to indicate momentum is turning. And your gain turns into a loss. There’s nothing wrong with selling into strength and taking some of your gains off the table.