Don’t wanna be pedantic (yes I do) but after a little bit of searching, the originally presented quote seems correct (without the “and” though, it seems). Your version is mixed with a common misquote “Slowly at first, then all at once.” of that quote.
I’m just relieved to see マッドハウス (madhouse) on there. I was mildly worried they’d give it the OPM treatment.