In 1631, he tried to return to Holland, but the authorities remained hostile to him. He moved to Hamburg in 1632. But as early as 1634, the Swedes - a European superpower - sent him to Paris as ambassador. He remained in this position for ten years, where he had the mission to negotiate for Sweden at the end of the Thirty Years' War. During this period, he had been interested in the unity of Christians and published many texts that would posthumously (1679) be published under the title of Opera Omnia Theologica.
in 1631 he tried to return to holland but the authorities remained hostile to him he moved to hamburg in 1632 but as early as 1634 the swedes - a european superpower - sent him to paris as ambassador he remained in this position for ten years where he had the mission to negotiate for sweden at the end of the thirty years' war during this period he had been interested in the unity of christians and published many texts that would posthumously (1679) be published under the title of opera omnia theologica