When we have the same thought again, the line of the original thought is deepened, causing what's called a memory trace. With each repetition the trace goes deeper and deeper, forming and embedding a pattern of thought. When an emotion is tied to this thought pattern, the memory trace grows exponentially stronger.
Lysa TerKeurst, Unglued: Making Wise Choices in the Midst of Raw Emotions
christian-living, emotions, thoughts, women