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In page Nadezhda von Meck:

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They carried on a significant correspondence, exchanging over 1,200 letters between 1877 and 1890. The details they shared were extraordinary for two people who never met. He was more open to her about much of his life and his creative processes than to any other person. Her feedback became so important to him that, after the critics lambasted his Fifth Symphony, she provided him with the support to persevere with his composing.[1] Von Meck died believing these letters had all been destroyed. However, when Tchaikovsky received her request to do so, he assured her that he had destroyed them, but then filed that letter with all the rest for posterity to find.[citation needed]