beyond contradiction

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References in classic literature ?
Showing the truth of many observations of Ovid, and of other more grave writers, who have proved beyond contradiction, that wine is often the forerunner of incontinency.
I think Major Gallacher has far more explaining to do to convince me that his thinking is beyond contradiction.
He continued: "Trust and approval are at record highs, our services are in brilliant creative form and we've demonstrated beyond contradiction that the BBC can be just as much of a leader and innovator in the digital age as we once were in the analogue one.