As long as you do not feel that God is the Master, you must come back to the world, you must be born again and again. There will be no rebirth when you can truly say, ‘O God, Thou art the Master.’ As long as you cannot say, ‘O Lord, Thou alone art real’, you will not be released from the life of the world. This going and coming, this rebirth, is inevitable. There will be no liberation. Further, what can you achieve by saying, ‘It is mine’? The manager of an estate may say, ‘This is our garden; these are our couches and furniture.’ But when he is dismissed by the master, he hasn’t the right to take away even a chest of worthless mango-wood given to him for his use. The feeling of ‘I and mine’ has covered the Reality. Because of this we do not see Truth. Attainment of Chaitanya, Divine Consciousness, is not possible without the knowledge of Advaita, Non-duality. After realizing Chaitanya one enjoys Nityananda, Eternal Bliss.
(p.308 The Gospel of Sri Ramakrishna, Thakur’s words to devotees on 16 Oct,1883.)