key to happiness... i dunno. is there a generalized standard for everyone? doubtful.
if so... id probably have to say happiness and confidence in yourself. once you have that, you're able to love and be loved. you're able to be happy in what you do. enjoy your work and/or your hobbies. embrace all your bad qualities, but not dwell on them.
mathematically, you should proabbly also concentrate 80% on the here and now, 12% on the future, and 8% on the past. (and, this is probably where i get hurt the most, cuz im constantly regretting things i've done or could have done)
