Accordingly, from Madras he wrote a letter to Sarada Devi. By the time he received a reply from her, he had had a most significant dream in which he saw Sri Ramakrishna proceed to the West over the waves and waters. In the dream, Sri Ramakrishna was beckoning Vivekananda to follow him. This Vivekananda took for approval of his plan.
Presently he received wholehearted permission and blessings from his spiritual Mother. Now all Vivekananda's doubts vanished. With redoubled faith, he was able to undertake his historic voyage.From:Sri Chinmoy,Transfiguration and other stories, Agni Press, 2007
Sourced from https://srichinmoylibrary.com/trn