What 'upadesa' did Ramakrishna offer Vivekananda, who spread the glory of his Guru all over the world and also spread his message? It was verily Rama Nãma! If Vivekananda succeeded in all his accomplishments in the world through mere fruit of Rama Nãma japa, is not one able to comprehend the glory of Nãma?
Extract from "Life of Ramakrishna" published by Advaita Ashrama and forwarded by Mahatma Gandhi
Sri Ramakrishna had spent his last days in Cossipore garden when his health was deteriorating day by day.
One day he initiated Narendra (Swami Vivekananda) with the name of Rama, which, he said, was his own Ishta-mantra (Beloved Name). It produced a miraculous effect. Narendra was filled with bliss and in the intoxication of it went round the house, uttering the name of Rama. He was in such an exalted mood that none dared approached him. After this had gone on for hours, the other disciples grew alarmed and reported it to Sri Ramakrishna, who simply said, "Let him be. He will recover in due course." But it was 4 o' clock before Narendra regained normal consciousness.