This can be over-emphasized. WP uses quotations when appropriate, because it is more objective to let people speak in their own words than to attempt a paraphrase; the fairness of summary or paraphrase can always be debated, while a documented quote cannot. Similarly with primary sources. The fairness issue here is in the selection, placement, and use of these sources, for even direct quotations or excepts can be used to express a POV. ''''''