Shiva Purana
तमप्रतर्क्यं याथात्म्यं भक्तिमानेव पश्यति ॥ भक्तिश्चास्य प्रसादेन प्रसादादेव निर्वृतिः ॥ १८ ॥
Only the devotee sees the lord whose real nature cannot be reflected upon or argued over. Devotion is acquired through grace and through grace is bliss attained.
english translation
tamapratarkyaM yAthAtmyaM bhaktimAneva pazyati ॥ bhaktizcAsya prasAdena prasAdAdeva nirvRtiH ॥ 18 ॥
hk transliteration by Sanscript