Vijnana Bhairava Tantra
कुहनेन प्रयोगेण सद्य एव मृगेक्षणे । समुदेति महानन्दो येन तत्त्वम् प्रकाशते ॥ ६६ ॥
O gazelle-eyed one, verily by applying the performance of religious austerities, great bliss arises immediately, by which the essence is illumined.
english translation