Yet we must not underestimate the disturbing scenarios that threaten our future, or the powerful new instruments that the “culture of death” has at its disposal. To the tragic and widespread scourge of abortion we may well have to add in the future — indeed it is already surreptiously present — the systematic eugenic programming of births. At the other end of the spectrum, a pro-euthanasia mindset is making inroads as an equally damaging assertion of control over life that under certain circumstances is deemed no longer worth living. Underlying these scenarios are cultural viewpoints that deny human dignity. These practices in turn foster a materialistic and mechanistic understanding of human life. Who could measure the negative effects of this kind of mentality for development? How can we be surprised by the indifference shown towards situations of human degradation, when such indifference extends even to our attitude towards what is and is not human? What is astonishing is the arbitrary and selective determination of what to put forward today as worthy of respect. Insignificant matters are considered shocking, yet unprecedented injustices seem to be widely tolerated. While the poor of the world continue knocking on the doors of the rich, the world of affluence runs the risk of no longer hearing those knocks, on account of a conscience that can no longer distinguish what is human. God reveals man to himself; reason and faith work hand in hand to demonstrate to us what is good, provided we want to see it; the natural law, in which creative Reason shines forth, reveals our greatness, but also our wretchedness insofar as we fail to recognize the call to moral truth.
--- Pope Benedict XVI, Caritas In Veritate, para. 75.