Missionaries in the developing world waste a lot of time and money (not to mention the goodwill of non-Christians) proselytizing to the needy. . . . While missionaries do many noble things at great risk to themselves, their dogmatism still spreads ignorance and death. By contrast, volunteers for secular organizations . . . do not waste . . . time telling people about the virgin birth of Jesus. Nor do they tell people in sub-Saharan Africa - where nearly four million people die from AIDS every year - that condom use is sinful.

I consistently encounter people in academic settings and scientists and journalists who feel that you can't say that anyone is wrong in any deep sense about morality, or with regard to what they value in life. I think this doubt about the application of science and reason to questions of value is really quite dangerous.

Ten years have now passed since many of us first felt the jolt of history-when the second plane crashed into the South Tower of the World Trade Center. We knew from that moment that things can go terribly wrong in our world-not because life is unfair, or moral progress impossible, but because we have failed, generation after generation, to abolish the delusions of our ignorant ancestors.

To say that I would have done otherwise had I wanted to is simply to say that I would have lived in a different universe had I been in a different universe.

Theology is ignorance with wings.

Science has long been in the value business. Despite a widespread belief to the contrary, scientific validity is not the result of scientists abstaining from making value judgments; rather, scientific validity is the result of scientists making their best efforts to value principles of reasoning that link their beliefs to reality, through reliable chains of evidence and argument.

Unlike statements of fact, which require no further work on our part, lies must be continually protected from collisions with reality.