Are there any benefits to practicing a belief?

At first glance yes.

However, as soon as we study cognitive dissonance, we understand that this gain in terms of the feeling of security corresponds to a loss in terms of confinement, an inability to simply manage problems.

Explanation

The objective facts are a coherent whole.

And therein lies the whole problem: history shows us that in many cases, the practice of a belief produces a benefit for the individual, to the detriment of others.

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Refer to questions
What is cognitive dissonance?
Why the love of one's neighbor is not a solid basis for living well together
What does it take to be a good person?
Consult Krishnamurti's work, and read the book A theory of cognitive dissonance by Leon Festinger