Orison Swett Marden 
Power Peace and Plenty [EPUB ebook] 
The Secret is in your Mind

Never before in the history of mankind has there been such an awakening to the great possibilities of the power of right thinking as we are now witnessing in all civilized countries. Metaphysical schools are springing up under different names in all parts of the enlightened world. People are getting hold of little bits of one great divine truth, a new gospel of optimism and love, a philosophy of sweetness and light, which seems destined to furnish a universal principle upon which people of all nations, of varying philosophies and creeds, can unite for the betterment of the race.