Take seriously

对某人某事严肃认真 当真 重视

You do not have to take things too seriously
你不必遇事太认真。
As he never seemed to take himself seriously, he was not taken seriously by others.
他似乎从不自重，别人亦不重视他。
You surely can't expect us to take him seriously.
你当然不能指望我们把他当真了。