The soul attracts that which it secretly harbors; that which it loves, and also that which it fears; it reaches the height of its cherished aspirations; it falls to the level of its unchastened desires, and circumstances are the means by which the soul receives its own. Every thought-seed sown or allowed to fall into the mind, and to take root there, produces its own, blossoming sooner or later into act. Good thoughts bear good fruit, bad thoughts bad fruit. Following the inmost desires, aspirations, thoughts, by which one allows oneself to be dominated (pursuing the will-o-the-wisps of impure imagining or steadfastly walking the highway of strong and high endeavor), a person at last arrives at their fruition and fulfillment in the outer condition of life.

–James Allen, As a Man Thinketh