“Everything can be taken from a man but one thing,” Frankl wrote in Man’s Search for Meaning, “the last of the human freedoms – to choose one’s attitude in any given set of circumstances, to choose one’s own way.”

This uniqueness and singleness which distinguishes each individual and gives a meaning to his existence has a bearing on creative work as much as it does on human love. When the impossibility of replacing a person is realized, it allows the responsibility which a man has for his existence and its continuance to appear in all its magnitude. A man who becomes conscious of the responsibility he bears toward a human being who affectionately waits for him, or to an unfinished work, will never be able to throw away his life. He knows the “why” for his existence, and will be able to bear almost any “how.”

How do the happy life and the meaningful life differ? Happiness, they found, is about feeling good. Specifically, the researchers found that people who are happy tend to think that life is easy, they are in good physical health, and they are able to buy the things that they need and want. While not having enough money decreases how happy and meaningful you consider your life to be, it has a much greater impact on happiness. The happy life is also defined by a lack of stress or worry.

“Happy people get a lot of joy from receiving benefits from others while people leading meaningful lives get a lot of joy from giving to others

What sets human beings apart from animals is not the pursuit of happiness, which occurs all across the natural world, but the pursuit of meaning, which is unique to humans,

Meaning is not only about transcending the self, but also about transcending the present moment – which is perhaps the most important finding of the study, according to the researchers. While happiness is an emotion felt in the here and now, it ultimately fades away, just as all emotions do; positive affect and feelings of pleasure are fleeting. The amount of time people report feeling good or bad correlates with happiness but not at all with meaning.

Meaning, on the other hand, is enduring. It connects the past to the present to the future. "Thinking beyond the present moment, into the past or future, was a sign of the relatively meaningful but unhappy life,” the researchers write. “Happiness is not generally found in contemplating the past or future.” That is, people who thought more about the present were happier, but people who spent more time thinking about the future or about past struggles and sufferings felt more meaning in their lives, though they were less happy.