The Great Epic of the Bhārata dynasty 13.17.160

13.17.160

nirvighnā niścalā rudre bhaktiravyabhicāriṇī |
tasyaiva ca prasādena bhaktirutpadyate nṛṇām |
yayā yānti parāṃ siddhiṃ tadbhāvagatacetasaḥ || 160 ||

Isana, in all their successive lives and adore him in thought, word, and deed, and adoring him thus at all times, viz. when they are lying or seated or walking or awake or opening the eyelids or shutting them, and thinking of him repeatedly, become objects of reverence with all their fellowmen and derive great gratification and exceeding joy. When a creature becomes cleansed of all his sins in course of millions of births in diverse orders of being, it is then that devotion springs up in his heart for Mahadeva. It is through good luck alone that undivided devotion to Bhava who is the original cause (of the universe) fully springs up in the heart of one that is conversant with every mode of worshipping that great Deity. Such stainless and pure devotion to Rudra, that has singleness of purpose and that is simply irresistible in its course, is seldom to be found among even the deities, and never among men. It is through the grace of Rudra that such devotion arises in the hearts of human beings. In consequence of such devotion, men, identifying themselves wholly with Mahadeva, succeed in attaining to the highest success. The illustrious Deity who is always inclined to extend his grace towards them that seek him with humility, and throw themselves with their whole soul upon him rescues them from the world.