Did Ellen White forbid preachers to quote her in their sermons?
Though some may, indeed, be using this statement for that purpose, that doesn’t mean they’re right. Taking the statement as forbidding the use of Mrs. White’s writings from the pulpit would also forbid the use of the preacher’s own words, wouldn’t it? Likewise, it would forbid the use of any other writer’s words, since “the words of the Bible, and the Bible alone, should be heard from the pulpit.” We could do worse than just reading Scripture from the pulpit, but clearly this is not what Mrs. White meant by that statement. Rather, she was contrasting the presentation of Bible truth with human opinions.