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"It is foolish to be convinced without evidence, but it is equally foolish to refuse to be convinced by real evidence." Upton Sinclair
It is difficult to get a man to understand something, when his salary depends on his not understanding it. by Upton Sinclair
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It is difficult to get a man to understand something, when his salary depends on his not understanding it. - Upton Sinclair
"It is difficult to get a man to understand something when his salary depends upon his not understanding it." - Upton Sinclair