No Church document better explains and defends the Church’s timeless teaching about the family than Humanae Vitae. In this encyclical, promulgated on July 25, 1968, Pope Paul VI sends a saving message to a secular and suffering world. Blessed Paul VI explains how the spread of artificial contraception constitutes a poison that invites tyrants, both political and cultural, to attack and control the most intimate aspects of family life.

It is no wonder that Humanae Vitae has been fiercely attacked by the forces of the Dictatorship of Relativism since the day it appeared.

Yet Blessed Paul’s predictions have proven prophetic:

Brutal mandatory population control policies have been introduced in many countries, including India, China, and Peru. There has been a loss of respect for women and a general lowering of moral standards. There has been an increase in marital infidelity. In all these ways, the integrity of the family has been profoundly violated.

On this site The Humanae Vitae Project, sponsored by the Population Research Institute (, presents the most thorough and accurate history of artificial contraception, from its roots in the early twentieth century through the promulgation of Humanae Vitae in 1968. The brilliant work, authored by Professor Gonzalo Herranz of the University of Navarra, provides all you need to understand and defend God’s command to our first parents, “Be fruitful and multiply.” We offer below summaries of each chapter in English, each with a link to the full text Spanish text.