One of the most important teaching of Hinduism is that there is no difference between the worshipper and worshipped. Maha Periyava (Sage of Kanchi) explains this core teaching.
Devotion in the Advaita system implies adopting an attitude of non-difference between the worshipper and the worshipped; that is the devotee must look upon Ishwara as not being different from himself. It might be asked: "The devotee who worships the omnipotent and omniscient Lord has only very limited strength and knowledge. How can the two of them be the same? “But the question also arises: "Does God regard us as being different from himself? If there are objects, entities, different from God how did they originate? If they came into existence as entities separate from Him how can He hold sway over them? ".
If we think on these lines it will become clear that the one and only Paramatman exists in various forms: if the ocean stands for Isvara we have in contrast the pond, the well and the little quantity of water contained in a spoon and so on that stand for diverse living beings. The water in all is the same. There maybe differences in the strengths of the various entities. But if you go to the base, the ground or root, you will discover that they are the same.
If we go to the root we will become one with the root. This is liberation according to Advaita. Merely to talk about non-dualistic liberation is nothing more than an Intellectual exercise and will serve no purpose. The truth of such liberation must become an inward reality. In other words the quest must culminate in actual experience and it can be had only with the grace of Isvara. Great sages proclaim that it is only with the blessings of that Power which keeps us in a constant whirl of action that the whirl will stop and that we will have the Advaitic urge to seek the ground.
"Isvaranugrahadeva pumsam Advaitavasana.”