The "Paris Basis", published at the first YMCA World Conference in Paris in August 1855, serves as the foundation of the YMCA's work. The handwritten original of the "Paris Basis" is kept at the YMCA's archive in Geneva.
Paris Basis, colour photograph of the original manuscript, 2011, photographer: Romano1246; source: Wikimedia Commons, Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0).