Donald Hebb, a neuropsychologist, believed that neurons which fire together, wire together. What he meant by that is that groups of neurons connect in our brain as a result of particular life experiences.For instance, whenever we think a thought or have a feeling or physical sensation, thousands of neurons are triggered and they all get together to form a neural network. The brain learns to trigger the same neurons with repetitive thinking.
Basically, if you keep your mind focused on criticism, worry, and victimization, your mind will find it more easy to bring up those same thoughts for similar situations. Our thought patterns wire our brains to react positively or negatively to the situations we are presented. We get good at what we practice, so why don’t we try being a little more positive?
Everything is habit.