You read something that you thought only happened to you, and you discover that it happened 100 years ago to Dostoyevsky. This is a very great liberation for the suffering, struggling person, who always thinks that he is alone. This is why art is important. Art would not be important if life were not important, and life is important.
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Gender-inclusive version:

You read something that you thought only happened to you, and you discover that it happened 100 years ago to Dostoyevsky. This is a very great liberation for the suffering, struggling person, who always thinks that he or she is alone. This is why art is important. Art would not be important if life were not important, and life is important.