It is easy to forget, in an age of widespread scientific literacy, how radical it once was to defend the theory of evolution before a general audience. When Charles Darwin published On the Origin of Species in 1859, the American reception was mixed at best, hostile in many quarters, and the idea that a lawyer might tour the country arguing for natural selection before crowds of thousands was, for a time, genuinely provocative.
Robert Ingersoll was that lawyer.
Science as Liberation
For Ingersoll, science was not merely a method of inquiry but a liberating force — the intellectual tool that would, over time, free humanity from the fear and superstition that had kept it intellectually and morally stunted. He was not anti-religious in the sense of being indifferent to the profound questions that religion addressed; he was anti-superstition, anti-dogma, anti-coercion of the conscience. Science, he believed, offered better answers to those profound questions — or rather, it offered the honest acknowledgment that some questions might not have answers at all, which is infinitely preferable to a false certainty.
"Science has done more for the development of Western civilization in one hundred years than Christianity did in eighteen hundred years."
This was a fighting statement in the 1870s. It still raises hackles today. But Ingersoll was not making it as a taunt; he was making it as a challenge to complacency. He wanted his audiences to understand that the same intellectual rigor that had produced railroads, telegraphs, and anesthesia could also be applied to questions of ethics, politics, and the nature of the universe — and that when it was, the results would be more humane, more honest, and more useful than any theology.
Darwin and Human Dignity
Ingersoll's embrace of Darwinian evolution was wholehearted and, for its time, philosophically sophisticated. He understood — as many of his opponents did not — that evolution did not diminish human dignity but deepened it. To know that we are the products of billions of years of natural selection, that we share common ancestors with every living thing, that our consciousness emerged from matter through processes we can trace and understand: this, for Ingersoll, was more wonderful, not less, than any creation myth.
"We are the children of conditions," he wrote, "not of miracles. And this is a greater miracle than any other — that we are here, that we think, that we feel, that we love."
He praised Darwin in the same terms he used for the greatest moral heroes: as a man who had dared to follow the evidence wherever it led, at considerable personal cost, in the face of considerable social pressure to arrive at more comfortable conclusions. This, for Ingersoll, was the supreme form of intellectual courage.
Tyndall, Huxley, and the Herd of Evidence
Ingersoll was also a great popularizer of other scientists. He spoke enthusiastically of John Tyndall's work on light and heat, of Thomas Huxley's brilliant defenses of Darwinian evolution (Huxley, incidentally, coined the word "agnostic"), of Helmholtz's thermodynamics and the emerging discipline of geology. He translated these difficult ideas into language that a general audience could grasp and find exciting, arguing that the discoveries of science were among the most thrilling stories ever told — far more dramatic than any mythology.
He was, in a real sense, the Carl Sagan of the Gilded Age: a gifted communicator who understood that science done well is not dry and forbidding but magnificent and awe-inspiring.
The Limits of Knowledge
But Ingersoll was careful not to replace one dogmatism with another. He was an agnostic not just about God but about the limits of human knowledge generally. "I do not know" was, for him, a phrase of profound intellectual humility — and intellectual humility was the foundation of all genuine inquiry.
"The greatest of all things is honest doubt."
He believed that science, properly practiced, embodies that humility. Its conclusions are provisional; its methods are self-correcting; its authority rests not on assertion but on evidence. This is what distinguished it from theology, and this is why he championed it.
In Ingersoll's view, the spread of the scientific spirit — not just scientific facts, but the habit of mind that produces them — was the great hope of humanity. Not because science answers all questions, but because it teaches us the right way to ask them.