Contest entry:

Selfishness.
A selfish person is the one that primary thinks about ones self. There are two types of selfish, the ones that hurt others by actions and the others who are selfish in healthy quantities.
The first ones, the ones that give ''selfish'' a bad meaning are the ones who will eat the last piece of cake in front of a starving child, the ones that will drink all water from the flask in a desert, when there are 10 more people that are supposed to share it. The bad selfish is a person that hurts their loved ones just because they don't matter as much as this one person, that will demand to be taken care of in a hospital first, with a mild bruise, even though there is somebody bleeding out in front of them, those are self centered people who only see themselves in the world.
But, there is one but, there is also a good selfish, and we should all be a little bit selfish, because we must think of ourselves, too. Being completely selfless would mean not taking care of ones self and when you don't care about yourself, nobody else can help you, you have to be able to take care of yourself, only then you will be able to help others continuously.

Hope it is not too long, best wishes to everybody here:)