Today’s atheists would do well to emulate some of the great 19th-century American freethinkers, who insisted that reason and emotion were not opposed but complementary.

Robert Green Ingersoll, who died in 1899 and was one of the most famous orators of his generation, personified this combination of passion and rationality. Called “The Great Agnostic,” Ingersoll insisted that there was no difference between atheism and agnosticism because it was impossible for anyone to “know” whether God existed or not. He used his secular pulpit to advocate for social causes like justice for African-Americans, women’s rights, prison reform and the elimination of cruelty to animals.

He also frequently delivered secular eulogies at funerals and offered consolation that he clearly considered an important part of his mission. In 1882, at the graveside of a friend’s child, he declared: “They who stand with breaking hearts around this little grave, need have no fear. The larger and the nobler faith in all that is, and is to be, tells us that death, even at its worst, is only perfect rest ... The dead do not suffer.”

Today’s secularists must do more than mount defensive campaigns proclaiming that we can be “good without God.” Atheists must stand up instead of calling themselves freethinkers, agnostics, secular humanists or “spiritual, but not religious.” The last phrase, translated from the psychobabble, can mean just about anything — that the speaker is an atheist who fears social disapproval or a fence-sitter who wants the theoretical benefits of faith, including hope of eternal life, without the obligations of actually practicing a religion. Atheists may also be secular humanists and freethinkers — I answer to all three — but avoidance of identification with atheism confines us to a closet that encourages us to fade or be pushed into the background when tragedy strikes.

We must speak up as atheists in order to take responsibility for whatever it is humans are responsible for — including violence in our streets and schools. We need to demonstrate that atheism is rooted in empathy as well as intellect. And although atheism is not a religion, we need community-based outreach programs so that our activists will be as recognizable to their neighbors as the clergy.

Finally, we need to show up at gravesides, as Ingersoll did, to offer whatever consolation we can.

In his speech at an interfaith prayer vigil in Newtown on Dec. 16, President Obama observed that “the world’s religions — so many of them represented here today — start with a simple question: Why are we here? What gives our life meaning?” He could easily have amended that to “the world’s religions and secular philosophies.” He could have said something like, “Whether you are religious or nonreligious, may you find solace in the knowledge that the suffering is ours, but that those we love suffer no more.”

Somewhere in that audience, and in the larger national audience, there were mourners who would have been comforted by the acknowledgment that their lives have meaning even if they do not regard death as the door to another life, but “only perfect rest.”