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“Lust is but a bloody fire, kindled with unchaste desire, fed in heart, whose flames aspire as thoughts do blow them, higher and higher.  – The Merry Wives of Windsor

Whether we are talking about love, lust, or something else, what is in our thoughts feed our hearts.  If you think it much, it is deposited in your heart and becomes part of you, of what you believe, of who you are.  It shapes you, your immediate surroundings, and eventually your reality.