leverage 影響 grip

once-in-a-blue-moon 滅多にない

quibble about とやかく言う 屁理屈　criticism

Some purists may quibble about whether he said it exactly like this, or if he was actually paraphrasing something that Blaise Pascal had written earlier, in French. 

brevity　簡潔さ shortness

bottom line up front 結論から先に書くこと

pitfalls　落とし穴