<prompt> Translate the following text to EnglishKama ilivyoelezwa na Rayfield, kiwango cha afya ya Chekhov na mtazamo wake kuelekea afya yake ni jambo la kushangaza.  <response>: The overarching paradox of his life, lucidly detailed by Rayfield, is the state of Chekhovs health and his attitude toward it. 