Shiva Purana
बहुनात्र किमुक्तेन गुह्याद्गुह्यतरं परम् ॥ शिवे भक्तिर्न सन्देहस्तया युक्तो विमुच्यते ॥ २९ ॥
Of what avail is much talk? Devotion to Śiva is the secret of secrets. He who is endowed with it becomes liberated. There is no doubt in this.
english translation
bahunAtra kimuktena guhyAdguhyataraM param ॥ zive bhaktirna sandehastayA yukto vimucyate ॥ 29 ॥
hk transliteration by Sanscript