he who hesitates

he who hesitates (is lost)

Those who fail to take quick, decisive action will suffer for it or miss a good opportunity. A: "If only I'd invested in that company when they started up, I'd be a millionaire by now!" B: "Well, he who hesitates is lost." A: "You could have mitigated your losses if you'd dealt with the problem right away, but—" B: "Yeah, yeah, he who hesitates. I know."
See also: he, hesitate, who

he who ˈhesitates (is ˈlost)

(saying) if you delay in doing something you may lose a good opportunity: You should have applied for that job. I’m sure you would have got it. Remember, he who hesitates...
See also: he, hesitate, who
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And, as the old proverb says, he who hesitates is lost.
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