[祸福无常 / 禍福無常, huò fú wú cháng, ㄏㄨㄛˋ ㄈㄨˊ ㄨˊ ㄔㄤˊ]disaster and happiness do not follow rules (成语 saw); future blessings and misfortunes are unpredictable[Add to Longdo]
[むじょうじんそく, mujoujinsoku](n) the (fast) pace at which life passes, and thus the nearness of death; promptitude of the changes of the times[Add to Longdo]