On a Saturday night of 1879, he had a dream in which the whole world had been flooded with water. He was the lone survivor. When he was worried about his family, he heard a voice saying that No one is alive in this world. All are dead. Only they have survived from this deluge who have realized God. You will meet them very soon and live with them. He woke up at 4:00 AM and laid there perplexed for some time. When he regained his consciousness, he realized that it was a dream.
Later that morning he went to see his cousin Ram Chandra Datta and told him about the dream. Manomohan had read about the spiritual life of Sri Ramakrishna in the magazines like Indian Mirror, Sulabh Samachar, and other newspapers. So he suggested that they visit him in Dakshineswar. Ram immediately agreed. It was this dream that brought Manomohan to Sri Ramakrishna.
On Sunday, 13 November 1879, the day after that strange dream, he, Ram Chandra Datta, and their friend Gopal Chandra Mitra left for Dakshineswar by boat to visit Sri Ramakrishna. Since Manomohan was an ardent devotee of Keshub Chandra Sen and the Brahmo Samaj, he was averse to image worship. Sri Ramakrishna understood Manomohan's attitude and told him: As an imitation custard apple reminds one of the real fruit, so the divine images enkindle the presence of God. He is all powerful. It is possible for him to manifest in anything. Manomohan, Ram and Gopal had a long conversation with Sri Ramakrishna, and they returned to Calcutta that evening with full of peace and joy.