“I don’t know” is not equivalent to Montaigne’s sentence, the real quotation “What do I know?” especially when you consider he said that in the middle of the French religious wars. He refused to take sides and he refused to condemn or reject any side and support any side. “I don’t know” would have been condescending and a rejection of both, or more, sides. He refused to take sides, which states that both, or more, sides have some truth.