Shiva Purana
ये पुनस्सर्वभावेन प्रपन्नाः परमेश्वरम् ॥ ते हि जानंत्ययत्नेन शिवं परमकारणम् ॥ ३५ ॥
On the other hand, only those who have resorted to the lord in all piety know Śiva, the great cause, without any strain.
english translation
ye punassarvabhAvena prapannAH paramezvaram ॥ te hi jAnaMtyayatnena zivaM paramakAraNam ॥ 35 ॥
hk transliteration by Sanscript