Shiva Purana

siva.sh/siva-purana/rudra-samhita/56/27

न स्वज्ञेयो महेशानस्सर्ववेदायुतेन सः ।। भक्तेरनन्यशरणैर्नान्यथेति महाश्रुतिः ।। २७ ।।

sanskrit

Lord Śiva is not unknowable entirely. He can be known by devotees who have no other refuge though he is unknowable through thousands of Vedic passages without devotion. So says the great Vedic passage.

english translation

na svajJeyo mahezAnassarvavedAyutena saH || bhakterananyazaraNairnAnyatheti mahAzrutiH || 27 ||

hk transliteration by Sanscript