[2] Kubina served as procurator of the archdiocesan seminary in Poznań – as well as a lecturer in liturgy, Greek and Hebrew – between December 1923 and June 1928.
He began oriental studies at Adam Mickiewicz University in January 1924; he obtained a doctorate in philosophy on 4 June 1927 with his thesis Jahwe jako nomen ineffable.
[4] Kubina served as a prosynodal judge from 1933 to 1938, and on 1 November 1938 he was appointed rector of the Pontificium Collegium Polonorum in Rome.
[2][5] He was appointed protonotary apostolic ad instar participantium on 2 August 1952 and rector of the Church of the Most Holy Blood of Jesus in Poznań [pl] on 1 February 1956.
He was consecrated on 29 December 1957 at the Jasna Góra Monastery by Stefan Wyszyński, assisted by Antoni Baraniak and Bolesław Kominek.