I Masi remember suggestions first of mentors my very first time learning trading, allways  keep comfortable condition currently trading. trading-was the one with a smile.
then what effect we trading with a smile with the acquisition of profit?
this theory said that what we think and what we feel will "interesting" thing "like". that is, if the mind and our feelings positive, it will be interesting things positive. instead if thoughts and feelings we negative, it will be interesting things negative anyway. actually maybe you ever had evidence of the theory.