If you rush into a trade, chances are it will be a bad one. For example, ABC or XYZ stock suddenly makes a big move, and you're thinking I've got to have some of that. Well, probabilities suggest you're going to wish you hadn't got any of that.
Conversly, if you wait for a trade, chances are it will be a good one.
Summary: Be extremly wary of what I call 'rushed trades'.