To note his high spiritual state, his followers called him Mahasaya, which is a Sanskrit spiritual title translated as 'large-minded'. He was also popularly known as Yogiraj and Kashi Baba by his followers.
He organized many study groups and gave regular discourses on the Bhagavad Gita at his "Gita Assemblies." He freely gave Kriya initiation to those of every faith and status, from gardeners and postmen to kings; from Hindus to Muslims and Christians.
The Arya Mission Institution published commentaries by Lahiri on the Bhagavad Gita, along with other spiritual books, including a Bengali translation of the Gita. Lahiri himself had printed thousands of small books with excerpted passages from the Gita, in Bengali and Hindi, and distributed them for free.
He gave permission to one disciple, Panchanan Bhattacharya, to start an institution in Kolkata to spread the teachings of Kriya Yoga.
Some of his notable disciples included: - Panchanan Bhattacharya, - Swami Sri Yukteswar Giri - Swami Pranabananda, - Swami Keshavananda Brahmachari, - Bhupendranath Sanyal - The parents of Paramahansa Yogananda.