A centerpiece argument of Keller's response might be called the myth of secular neutrality. "Skeptics argue that they have
the intellectual high ground," he says, "but they are really making assumptions as well." An absolute doubt -- claiming that all truth is
culturally conditioned -- can work only if it exempts itself from doubt and assumes the cultural superiority of rationalism. Raging against evil and
suffering in the world assumes a moral standard of good and evil that naturalism cannot provide. Keller argues that the main criticisms of religion
require "blind faith" of their own, and he urges people to begin by doubting their doubts.
But while Keller argues that all worldviews contain assumptions of faith, reason is not futile. It may not provide proof, but it does provide clues.
The fundamental regularities of the universe that improbably favor life; the artistic beauty that reaches beyond materialism; the sense of love and
duty that seems so much more than evolutionary instinct -- Keller argues that only theism explains our lived experience and deepest desires. "God is
the only thing that makes sense of what we love."