最善を祈り最悪に備えよ

hope for the best （うまくいくように願う）は対のprepare for the worst と一緒に使われることがあります。0:28 prepare for the worst and hope for the best. 最悪に備え最善を望もう

https://www.youtube.com/watch?v=iTFKnwN9Q3o  2:34 prepare for the worst
https://www.youtube.com/watch?v=oW2Y9ckaXbk  0:42 hope for the best

練習問題解答
a-7896 prepare for the worst