We cannot interfere in one area of the ecosystem without paying due attention to both the consequences of such interference in other areas and to the well-being of future generations.
Pope John Paul IIFrom now on it is only through a conscious choice and through a deliberate policy that humanity can survive.
Pope John Paul IIThe lust of the flesh directs these desires [of personal union], however, to satisfaction of the body, often at the cost of a real and full communion of persons.
Pope John Paul IIEvery scientist, through personal study and research, completes himself and his own humanity. ... Scientific research constitutes for you, as it does for many, the way for the personal encounter with truth, and perhaps the privileged place for the encounter itself with God, the Creator of heaven and earth. Science shines forth in all its value as a good capable of motivating our existence, as a great experience of freedom for truth, as a fundamental work of service. Through research each scientist grows as a human being and helps others to do likewise.
Pope John Paul II