The Third Piece of Guidance Was Unite Humanity With a Living New Language

He writes a world language need not eliminate national languages. A common tongue for all nations may some day span chasms which would otherwise divide the human family. It will make possible the accurate transferal of thought down the long reaches of time. He's asking for global language that, even if it isn't known by everybody in every country, is used by professionals who conduct things like diplomacy and scholarship.