 Historians Passelecq and Suchecky have argued that Pacelli learned about its existence only after the death of Pius XI and did not promulgate it as Pope . He did use parts of it in his inaugural encyclical Summi Pontificatus , which he titled " On the Unity of Human Society . " His various positions on Church and policy issues during his tenure as Cardinal Secretary of State were made public by the Holy See in 1939 . Most noteworthy among the 50 speeches is his review of Church @-@ State issues in Budapest in 1938 . 
