Higher Devotion

साध्यसाधनखण्डे तृतीयोऽध्यायः 
Chapter 3, Objective-means block



ब्रह्मोवाच |
Lord Brahma said (to the six sages who had gone to him to resolve their debate)



एष देवो महादेवः सर्वज्ञो जगदीश्वरः |
अयं तु परया भक्त्या दृश्यते नान्यथा क्वचित् || 12 ||
This (is the) deity, the Great Deity (God, Shiva), the omniscient God of the world. This (God is) but visible by higher devotion, not by any other means.
The second half of this shloka repeats in Vayaviya Samhita, Earlier/east part, Chapter 3, shloka 23.