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Which brings us back to Frankl's life and, specifically, a decisive experience he had before he was sent to the concentration camps. It was an incident that emphasizes the difference between the pursuit of meaning and the pursuit of happiness in life.

Peter Andrews/Reuters Peter Andrews/Reuters

In his early adulthood, before he and his family were taken away to the camps, Frankl had established himself as one of the leading psychiatrists in Vienna and the world. As a 16-year-old boy, for example, he struck up a correspondence with Sigmund Freud and one day sent Freud a two-page paper he had written. Freud, impressed by Frankl's talent, sent the paper to the International Journal of Psychoanalysis for publication. "I hope you don't object," Freud wrote the teenager.

While he was in medical school, Frankl distinguished himself even further. Not only did he establish suicide-prevention centers for teenagers -- a precursor to his work in the camps -- but he was also developing his signature contribution to the field of clinical psychology: logotherapy, which is meant to help people overcome depression and achieve well-being by finding their unique meaning in life. By 1941, his theories had received international attention and he was working as the chief of neurology at Vienna's Rothschild Hospital, where he risked his life and career by making false diagnoses of mentally ill patients so that they would not, per Nazi orders, be euthanized.

That was the same year when he had a decision to make, a decision that would change his life. With his career on the rise and the threat of the Nazis looming over him, Frankl had applied for a visa to America, which he was granted in 1941. By then, the Nazis had already started rounding up the Jews and taking them away to concentration camps, focusing on the elderly first. Frankl knew that it would only be time before the Nazis came to take his parents away. He also knew that once they did, he had a responsibility to be there with his parents to help them through the trauma of adjusting to camp life. On the other hand, as a newly married man with his visa in hand, he was tempted to leave for America and flee to safety, where he could distinguish himself even further in his field.

As Anna S. Redsand recounts in her biography of Frankl, he was at a loss for what to do, so he set out for St. Stephan's Cathedral in Vienna to clear his head. Listening to the organ music, he repeatedly asked himself, "Should I leave my parents behind?... Should I say goodbye and leave them to their fate?" Where did his responsibility lie? He was looking for a "hint from heaven."

When he returned home, he found it. A piece of marble was lying on the table. His father explained that it was from the rubble of one of the nearby synagogues that the Nazis had destroyed. The marble contained the fragment of one of the Ten Commandments -- the one about honoring your father and your mother. With that, Frankl decided to stay in Vienna and forgo whatever opportunities for safety and career advancement awaited him in the United States. He decided to put aside his individual pursuits to serve his family and, later, other inmates in the camps.

The wisdom that Frankl derived from his experiences there, in the middle of unimaginable human suffering, is just as relevant now as it was then: "Being human always points, and is directed, to something or someone, other than oneself -- be it a meaning to fulfill or another human being to encounter. The more one forgets himself -- by giving himself to a cause to serve or another person to love -- the more human he is."

Baumeister and his colleagues would agree that the pursuit of meaning is what makes human beings uniquely human. By putting aside our selfish interests to serve someone or something larger than ourselves -- by devoting our lives to "giving" rather than "taking" -- we are not only expressing our fundamental humanity, but are also acknowledging that that there is more to the good life than the pursuit of simple happiness.