Yes 100% right. In condition of successful profitable trades we feel really like that. But after too much loss I got the point that there is no end of forex market. Your profit is just your luck at that time but might be it will not be yours at next time if your are over confident. Greed and over confidence causes loss and loss causes troubles in your capital. yes profit makes us over confident but this thing not sets at all the traders because all have different nature.but if any one of traders become over confident it is not beneficial for that trader and that thing will become a cause of his or her loss. so over confidence is not good thing not only in forex trading but in all the matters of our lives.