settled belief

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References in classic literature ?
Up to this time it had been her settled belief that he kept all his important documents in one or other of the suite of rooms which he happened to be occupying for the time being.
A conviction is a settled belief that brooks no argument.
The lethal combination of operations and accounting has long influenced top management thinking in our industry, and the most pervasive and pernicious result has been the settled belief that the cure for less profitability is more volume.