Conversation so far:
What was the influence of Brahmo Samaj on Swami Vivekanada?
Narendra became a member of the Sadharan Brahmo Samaj in his twenties. It was in this cultic milieu that Narendra became acquainted with Western esotericism.
What were Brahmo Samaj's ideas?
The belief in a formless God, the deprecation of idolatry, and a streamlined, rationalized, monotheistic theology strongly coloured by a selective and modernistic reading of the Upanisads and the Vedanta.“

Question: What else happened during Vivekanada's spiritual apprenticeship?
Self-contained rewrite: What else happened during Swami Vivekananda's spiritual apprenticeship?