If you have paid less then what the price is right now of course you could sell it for a profit. If you need the money I would do it. But do not sell everything at once because the price will get higher sooner or later.
Yes if you are in emergency then you should sell some part of it, selling all your coins together is never recommended as we never know what will the value of bitcoin in future.
People that sell all their coins regret it and buy back at higher levels if needed, just to get rid of their regrets. So yes, you are right with saying that it is better to sell only a part of your coins in case of emergency. If you have no other option than selling everything at once because you need all that money, then of course you must sell.
