杯弓蛇影 to be extremely suspicious
烈火见真金 People of worth show their morality during hardships.
狐假虎威 to bully people by flaunting one's powerful connections
异曲同工 to be different in approach but equally satisfactory in result
集腋成裘 Many a little makes a mickle.
有眼不识泰山 to entertain an angel unawares