Jacob Riis:
"When nothing seems to help, I go look at a stonecutter hammering away at his rock perhaps a hundred times without as much as a crack showing in it. Yet at the hundred and first blow it will split in two, and I know it was not that blow that did it, but all that had gone before."
There might be a bit more to it, in terms of what the Spurs post in their locker room, but that's the crux of the quote.

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