i think every trader has been feel that, greed is the famous mistakes that trader do. i stiil feel difficult to avoid greed although i always making practice. but now i try to make a post in my wall so i can remember to trade without greed. and loss can not be completely avoided, if we want to make profit we have to also suffer loss in terms of money or time. So we should always be ready for any one of the sacrifice. And reasons for loss are various and in them the main one is the lack of emotions control which is very much essential for the traders to make money.