 Maugham's suggestion that he "invented nothing" was a source of annoyance for Christopher Isherwood, who helped him translate a verse 1.3.14 from the Katha Upanishads for the novel's epigraph – उत्तिष्ठ जाग्रत प्राप्य वरान्निबोधत | क्षुरस्य धारा निशिता दुरत्यया दुर्गं पथस्तत्कवयो वदन्ति || (uttiṣṭha jāgrata prāpya varān nibodhata| kṣurasya dhārā niśitā duratyayā durga pathas tat kavayo vadanti|| ) – which means "Rise, wake up, seek the wise and realize.The path is difficult to cross like the sharpened edge of the razor (knife), so say the wise.