While searching for a man who could directly demonstrate the reality of God, he came to Ramakrishna and became his disciple. As a guru, Ramakrishna taught him Advaita Vedanta and that all religions are true, and service to man was the most effective worship of God. An eloquent speaker, Vivekananda was invited to several forums in United States and spoke at universities and clubs. He conducted several public and private lectures, disseminating Vedanta and Yoga in America, England and a few other countries in Europe. He also established Vedanta societies in America and England. He later sailed back to India and in 1897 founded the Ramakrishna Math and Ramakrishna Mission, a philanthropic and spiritual organization.
His meeting with Ramakrishna Paramahamsa in November 1881 proved to be a turning point in his life. About this meeting, Narendranath said, "He [Ramakrishna] looked just like an ordinary man, with nothing remarkable about him. He used the most simple language and I thought 'Can this man be a great teacher?'– I crept near to him and asked him the question which I had been asking others all my life: 'Do you believe in God, Sir?' 'Yes,' he replied. 'Can you prove it,