The path of Kriya Yoga requires enormous discipline and commitment and is not a practice to be undertaken lightly. Besides the life stories of the masters in Lahiri Mahasaya’s direct lineage, Kriya Yoga: Four Spiritual Masters and a Beginner by Heidi Wyder clearly explains what Kriya practice involves. It is packed with spiritual discussions with Guruji, and through the many examples and stories the devotee will be able to establish whether their motivation to learn from him is genuine.
Guruji wishes to establish that those coming to him are sincerely interested in Kriya Yoga. So if you are seeking Kriya Yoga initiation from Guruji, please read Kriya Yoga: Four Spiritual Masters and a Beginner by Heidi Wyder first.