Sri Nisargadatta Maharaj 
The Experience of Nothingness [EPUB ebook] 
Sri Nisargadatta Maharaj’s Talks on Realizing the Infinite

With this, the final volume of a trilogy, Nisargadatta clearly demonstrates that logic and spirituality do not necessarily stand in opposition to one another. In a chapter after which this book has been titled, Nisargadatta relentlessly pursues a logical argument with his visitor to its very end, showing that until there is transcendence of all thought, logic remains fully valid and should be pursued rigorously.