 Kalinowski returned to Warsaw in 1874, where he became a tutor to 16-year-old Prince August Czartoryski.The prince was diagnosed with tuberculosis in 1876, and Kalinowski accompanied him to various health destinations in France, Switzerland, Italy, and Poland.Kalinowski was a major influence on the young man (known as "Gucio"), who later became a priest and was beatified by Pope John Paul II in 2004.