风云不测

Explanation: The vagaries of the situation metaphor 　　Source: "At first carved Pai An Jing Qi" Juanjiu Who knows sometime unexpected situation, with the unanimous Taijian officials saw the dang rich, on the parameters of his personal spoils, taken it for granted units issued under the West censor, accept supervision of Mian Bude. " 　　Examples: Turbulent times of war, ~, people Jieyou sense of insecurity.