Txhawm rau tiv thaiv tib neeg txoj kev noj qab haus huv los ntawm kev raug hem, cov khoom ntim hauv lub qhov rooj ntoo yog txhua yam tsis muaj tshuaj lom thiab tsis zoo rau cov hluav taws kub thiab cov khoom siv hluav taws xob. Lub qhov rooj hluav taws ntoo yog tsim los ntawm cov khoom siv hluav taws xob tiv thaiv hluav taws (thiab iav hluav taws xob), uas tuaj yeem ua tau raws li qee qhov kev txwv hluav taws kub.