Because all natural processes move down-gradient, heat will always move from hot to cold.
Heat means an energy that is transferred between a component and its environment as a result of temperature difference across the location.
Heat will always move from being hot to cold because all natural processes will always move down-gradient which means energy is transferred from high - lower body.
Note that the second law of thermodynamics also states that "hot things always cool down, unless something is done to prevent the heat from going down"
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