Physics does not change the nature of the world it studies, and no science of behavior can change the essential nature of man, even though both sciences yield technologies with a vast power to manipulate the subject matters.

For this reason Paul VI teaches in the first sentence of Humanae Vitae that the transmission of human life is a most serious role in which married people collaborate freely and responsibly with God the Creator. On 28 March with Pontificalis Domus and in several additional Apostolic Constitutions in the following years he revamped the entire Curia which included reduction of bureaucracy streamlining of existing congregations and a broader representation of non-Italians in the curial positions. The declaration did not end the schism but showed a desire for greater reconciliation between the two churches.

and the advent of the contraceptive pill. While in the Secretariat of State Montini and Domenico Tardini were considered as the closest and most influential co-workers of Pope Pius XII who in 1954 named him Archbishop of Milan the largest Italian diocese while not naming Montini a cardinal a designation that traditionally accompanies the position; Montini automatically became Secretary of the Italian Bishops Conference. The magnitude and depth of the reforms affecting all areas of Church life during his pontificate exceeded similar reform policies of his predecessors and successors.