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There cannot be greater rudeness than to interrupt another in the current of his discourse.

John Locke (1824). “The Works of John Locke: Some thoughts concerning education. An examination of P. Malebranche's opinion of seeing all things in God. A discourse of miracles. Memoirs relating to the life of Anthony, first earl of Shaftesbury. Some familiar letters between Mr. Locke and several of his friends”, p.139
There cannot be greater rudeness than to interrupt another in the current of his discourse.