Control emotion. Don't be greedy.....

I have to remind myself that in investing, we need to control our emotion. Please don't be greedy when buying an explosive growing stock in short period as what happen to me in MTDACPI today. The stock suddenly become very active in very short period. i don't know what the news as so many people chasing this stock. Initially i make some handsome profit from this uptrend but the tide turn against me when the price going down after i'm buying some more at higher price. This is greedy and at the end, i'm the become the loser...so many time happen to me... This the thing i need to manage and control myself in the future. Greedy, greedy always end with the sadness......