Human beings are all the same , no matter how evil this person is , he or she still has a side of buddha , no matter how good the other person is , he or she still has a side of monster . This is human , our heart have both black and white colour just like a 八卦 (the black and white symbol for taoism ) . In short , there are no 'good' people or 'bad' people , only simply human is what we are . Actually life should be very simple just like a 八卦 , with only 2 colours , black and white . The more simple it is , the more easier we will be contented and thus , the more happy we will be . Isn't that so ?