The Instrumental Value of Religion - Simone Weil use to blame Pascal for his wager...

From NYT:

Michael McCullough and a fellow psychologist at the University of Miami, Brian Willoughby, have reviewed eight decades of research and concluded that religious belief and piety promote self-control.
(...)Dr. McCullough has no evangelical motives. He confesses to not being much of a devotee himself. “When it comes to religion,” he said, “professionally, I’m a fan, but personally, I don’t get down on the field much.”
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"We simply asked if there was good evidence that people who are more religious have more self-control,” Dr. McCullough. “For a long time it wasn’t cool for social scientists to study religion, but some researchers were quietly chugging along for decades. When you add it all up, it turns out there are remarkably consistent findings that religiosity correlates with higher self-control.”

In one personality study, strongly religious people were compared with people who subscribed to more general spiritual notions, like the idea that their lives were “directed by a spiritual force greater than any human being” or that they felt “a spiritual connection to other people.” The religious people scored relatively high in conscientiousness and self-control, whereas the spiritual people tended to score relatively low.

“Thinking about the oneness of humanity and the unity of nature doesn’t seem to be related to self-control,” Dr. McCullough said. “The self-control effect seems to come from being engaged in religious institutions and behaviors.”
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Personality studies have identified a difference between true believers and others who attend services for extrinsic reasons, like wanting to impress people or make social connections. The intrinsically religious people have higher self-control, but the extrinsically religious do not.
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Religious people, he said, are self-controlled not simply because they fear God’s wrath, but because they’ve absorbed the ideals of their religion into their own system of values, and have thereby given their personal goals an aura of sacredness.