There's no such thing as certainty when it come to trading markets. You have to be neutral to make make appropriate decisions about them.
Emotion tends make us do really bad trades and certainty is one of them.
Absolutely true. Or maybe we should leave the many emotions and attachments to people who love to do HODL even in the face of many uncertainties and gloom. As for traders, no emotions whatsoever can be needed in making the right and profitable decisions. As of now, many are predicting "glowful" scenarios for 2019 that can happen with the cryptocurrency market and this is just a natural reaction pattern when the year is ending but as to what will really happen in 2019 nobody really knows. Well, all I say is that it is good to hope always but we also have to be prepared for the worst as things will always go down to the law of supply and demand.