In the autumn of 1927 he was invited by the mayor of Stockholm and Prince Charles to lead Esperanto courses in Sweden, including in the Swedish parliament.

In April 1929 the first printed edition of his course appeared in book form, written in shorthand and published in Stockholm.

In 1942, during the German occupation of the Netherlands, Cseh and Isbrücker held a secret meeting to found the Universala Ligo [eo], a World Federalist organization which they continued to lead for years.

He died on 9 March 1979 in The Hague, Netherlands[2] Cseh led successful Esperanto courses for all types of people, unaware that due to concerns about marriages of mixed religions, the current bishop of Harlem, J.D.J.

Cseh's comprehension of Dutch was poor, so he did not fully comprehend Aengenent's order; for this reason, he continued to teach his Esperanto courses as he had before.

As a result, on 6 January 1978, Cseh received a touching letter from Monsignor Zwartkruis, then bishop of Harlem, which informed him that his rights as priest had been reinstated.