This is a compilation from the Complete Works of Swami Vivekananda. Readers interested to know about the preparations needed for experiencing spiritual truths will find this booklet highly informative and inspiring, and at the same time, concise and brief.
What I want is muscles of iron and nerves of steel, inside which dwells a mind of the same material as that of which the thunderbolt is made.
-Swami Vivekananda