Shiva Purana
शिवस्य कृपया साक्षाच्छिव लोकस्य वैभवम् । विज्ञातुं शक्यते सर्वैर्नान्यथेत्याहुरास्तिकाः 1-17-१२० ।
The full grandeur and greatness of Śivaloka can be known by any one only out of the grace of Śiva and not otherwise, so say the faithfuls.
english translation
zivasya kRpayA sAkSAcchiva lokasya vaibhavam । vijJAtuM zakyate sarvairnAnyathetyAhurAstikAH 1-17-120 ।
hk transliteration by Sanscript