Psychologically, the kind of food we feed our minds with is pretty much different from the physical food we eat. Basically, the kinds of words we feed our minds with are food on their own whether positive or negative. These words could have either nourishing or poisoning effects on our minds.
Furthermore, if the kind of words we feed our minds with are positively nourishing, they become more productive due to the positive vibes they are bubbling under. They are more ready to achieve a set goal and break every limitations often associated with mind barriers. Interestingly, these nourishing positive words are lights to the human minds. They have the power to illuminate every corners of the mind and ensure there's no room for negativity.
Conversely, the mind is also vulnerable to negative words as food being fed to it. These negative words are so poisonous that they deem the light in our minds making them hard for the bearers to reach their full potentials in life.
Finally, we should be conscious of the kind of food we feed our minds with. If really we want to achieve more in life, we should learn to feed our minds with the nourishing positive words, and not the poisonous negative words.