The james-lange theory of emotion states that

to experience emotion is to be aware of one's physiological responses to an emotion-arousing event.

Explanation:

According to this theory, emotion that we felt is a direct result of brain stimulation that occurs in response to external events that we face in our life.

When we experience that event, our brain will process that event and determine whether that event essentially good or bad for us. If that event is perceived as 'bad' for example, it will send signals to various part of our bodies (such as increasing our heart rate, increasing the tension of our organ)   that lead to the nauseating feeling that we felt when we receive a bad news.

i think i agree because it is telling you to always believe in yourself.

a. favoring native born americans over immigrants.