Shiva Purana
दुःखमेव हि सर्वो ऽपि संसार इति निश्चितम् ॥ कथं दुःखमदुःखं स्यात्स्वभावो ह्यविपर्ययः ॥ ८३ ॥
It is certain that the entire worldly existence is misery itself. How can misery be non-misery? The innate nature cannot be otherwise.
english translation
duHkhameva hi sarvo 'pi saMsAra iti nizcitam ॥ kathaM duHkhamaduHkhaM syAtsvabhAvo hyaviparyayaH ॥ 83 ॥
hk transliteration by Sanscript