William Walker Atkinson 
Your Mind and How to Use It: A Manual of Practical Psychology (Unabridged) [EPUB ebook] 
From the American pioneer of the New Thought movement, known for Thought Vibration, The Secret of Success, The Arcane Teachings & Reincarnation and the Law of Karma

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‘Psychology is generally considered to be the science of mind, although more properly it is the science of mental states—thoughts, feelings, and acts of volition. It was formerly the custom of writers on the subject of psychology to begin by an attempt to define and describe the nature of mind, before proceeding to a consideration of the subject of the various mental states and activities. But more recent authorities have rebelled against this demand, and have claimed that it is no more reasonable to hold that psychology should be held to an explanation of the ultimate nature of mind than it is that physical science be held to an explanation of the ultimate nature of matter. The attempt to explain the ultimate nature of either is futile—no actual necessity exists for explanation in either case. Physics may explain the phenomena of matter, and psychology the phenomena of mind, without regard to the ultimate nature of the substance of either.’ (William Walker Atkinson, Your Mind and How to Use It)
William Walker Atkinson (1862-1932) was a prolific writer. His works treat themes related to the mental world, occultism, divination, psychic reality, and mankind’s nature. They constitute a basis for what Atkinson called ‘New Psychology’ or ‘New Thought’.