One of the questions that seekers, philosophers, scientists and theologians world over have involved themselves from time immemorial is about the origin of the universe. The views vary from our Universe coming out of Big Bang to creationist views of world being created one fine day by God. It is only in Hindu religion that one finds a comprehensive analysis and explanation of various aspects and realms of Cosmos and its origin.
Bhakti or devotion is a concept, which is found throughout the world in one form or the other. From Christian prayers and Islamic namaz to Hindu puja and bhajans, elements of Bhakti are present in all the religions.
When the object and subject have merged together, what remains to be perceived? The knower and the known have become one in this state. 'Yatra tv asya sarvam atmaivabhut'- where only atman pervades everything, there is no creature and no creation.
Liberation from the cycle of birth and death (Moksha) is not possible without Atma Jnana (Self Realization). And any spiritual goal is unattainable without Sadhana. Hence a person desiring Atma Jnana must first develop Adhikara/competencies that make him eligible to practice the Sadhana.