John Locke Quote

There cannot be a greater rudeness, than to interrupt another in the current of his discourse... To which, if there be added, as is usual, a correcting of any mistake, or a contradiction of what has been said, it is a mark of yet greater pride and self-conceitedness, when we thus intrude our selves for teachers, and take upon us either to set another right in his story, or shew the mistakes of his judgement.

Sec. 145 - Some Thoughts Concerning Education (1693)