With all these clouds gathering it's as sure as death to rain before evening.

天上的云层已经这么厚了，傍晚前一定会下雨的。

I'm sure you would have as much pleasure as I in witnessing the conclusion of the fiend's existence; he'll be your death unless you overreach him; and he'll be my ruin.

我担保你亲眼看这恶魔的生命结束，会得到和我所得到的同等的愉快；他会害死你的，除非你先下手；他也会毁了我。