The Guarani live in the virgin forests of Misiones in Argentina. They are delicately-boned people, most of them rather small. Their ancestors were already roaming this region when the Spanish entered the country. The Jesuits brought with them their Catholic faith and gathered them in protected villages, the so-called “reductions” until their expulsion. All the same, the Guaraní have remained semi-nomads. The Christian faith has never been deeply rooted. The white population of Misiones despises them and would not expect anything good from them.

The Argentinian peasant Luis Weiss (of German descent) had been notorious as a brutal bully and alcoholic. His conversion was so dramatic that everyone could see how faith in Jesus was changing his life. Not only his white neighbours but also the neighbouring Guaraní Indians witnessed this change. They said to themselves: If faith in Jesus transforms a person in such a way, then we would also like to believe in Him. So Luis Weiss became their missionary. Since then, the radius of his missionary activities has been greatly extended, to the benefit of many Guaranís. His vision: Each Guaraní village shall be made familiar with Jesus Christ. It was a bitter setback when Luis Weiss very suddenly died in March 2006. Now a team including his two sons Juan Carlos and José Luis Weiss continues the work, with the Argentine-German pastor Helmut Kluge in charge.