U radu se govori o Leopoldu Bogdanu Mandiću i duhovnom ekumenizmu i u njegovo vrijeme i danas. Rad uz uvod i zaključak ima tri poglavlja. U prvom poglavlju pod naslovom 'Ukratko o životu' autori donose osnovne podatka iz života Leopolda Bogdana Mandića. Drugo poglavlje koje je naslovljeno 'Preteča duhovnog ekumenizma', autori preko tema katolički pogled na ekumenizam u vrijeme Leopolda Mandića; želja za sjedinjenjem s Istokom te Leopold Mandić i duhovni ekumenizam žele, naravno ukratko, prikazati ekumensko 'djelovanje' Bogdana Mandića i njegovu molitvu i žrtvovanje za ekumenizam te naglašavaju važnost osobnog rada na tom području. Treće poglavlje rada govori o važnosti duhovnog ekumenizma danas u kojem se polazi od Drugoga vatikanskog sabora, pa preko pape Ivana Pavla II. i pape Franje želi naglasiti važnost duhovnog ekumenizma u suvremenom svijetu.; The paper deals with Leopold Bogdan Mandic and spiritual ecumenism both in his time and today. The work, with the introduction and conclusion, has three chapters. In the first chapter, titled “Briefly about His Life”, the authors bring basic data from the life of Leopold Bogdan Mandic. In the second chapter, which is titled “The Forerunner of Spiritual Ecumenism”, the authors discuss the themes of a Catholic view of ecumenism at the time of Leopold Mandić, the desire of Leopold Mandić to unite with the East and spiritual ecumenism, trying to portray the ecumenical "activity" of Bogdan Mandic and his prayer and sacrifice for ecumenism and to emphasize the importance of his personal work in this area. The third chapter discusses the importance of spiritual ecumenism today, starting from the Second Vatican Council, to Pope John Paul II and Pope Francis, in order to highlight the importance of spiritual ecumenism in the modern world.