Carl Sagan on The moral argument

Sagan did not engage the moral argument as a formal philosophical debate, but his worldview provides a clear answer. He argued consistently that human beings are capable of compassion, justice, and moral reasoning without supernatural guidance — and that the best moral thinking requires precisely the kind of open-ended, evidence-based inquiry that religion tends to suppress.

In The Demon-Haunted World and in his public lectures, Sagan pointed to the expanding circle of moral concern — from family to tribe to nation to species to biosphere — as evidence that morality is a human achievement, not a divine gift. Each expansion was driven by reason and empathy, often against religious resistance. The moral arc of history bends not toward a divine lawgiver but toward the recognition that other beings have interests that matter.

Sagan also challenged the implicit claim that without God, life has no purpose and morality has no foundation. He found the universe's grandeur — its scale, its complexity, its indifference — not depressing but liberating. If we are the universe's way of knowing itself, then our moral choices matter not because a God is watching but because we are the only beings who can choose to make things better.