塞翁失马焉知非福

Yupe. It is your very mental model that defines the meaning of good and bad. This mental model is molded by your belief, culture, upbringing etc. By the way, "our thinking" is singular, so that would mean "our thinking makeS it so".

maybe it is right.something we think it is bad may turn out to be good.

（是非隨人說） 善惡憑心定

i am agree with Bright Chan, all things have the dual character ,mabye it's good for you and it's bad for others,no matter is good or bad has it's own value if it's worth us to do then we should do our best