We have to bear witness to the truth in a winsome and compelling way. The pro-life movement accomplished this on different levels. Specialists in science, law, philosophy, and theology laid the foundations of the pro-life case with research and writing in their disciplines, while advocacy groups tirelessly appealed to the hearts of the American people. Pro-lifers did much more than preach, launching a multitude of initiatives to help mothers in crisis pregnancies make the right choice.

Now we must employ reason to make the case for the truth about marriage, communicate this truth to our neighbors, and embody this truth in our families and communities. Just as the pro-life movement discovered the effectiveness of ultrasound and letting women speak for themselves, the pro-marriage movement will, I predict, find the social science on marriage and parenting and voices of the victims of the sexual revolution to be particularly effective. Just as grassroots pregnancy centers exposed the lie that abortion is a compassionate response to unplanned pregnancy, we must show what a truly loving response is to same-sex attraction.

In “Truth Overruled,” I explain, in clear and sober terms, the enormous task before us of defending our families, churches, schools, and businesses from opponents who now wield coercive power in government, commerce, and academia. My goal is to equip everyone, not just the experts, to defend what most of us never imagined we’d have to defend: our rights of conscience, our religious liberty, and the basic building block of civilization—the human family, founded on the marital union of a man and a woman.