Who decides your emotions - Psychology - Psychology Express

The well-known columnist Harris (Sydney J. Harries) and a friend were buying newspapers at a newsstand. The friend politely said "thank you" to the vendor, but the vendor remained cold and silent without a word. "This guy has a really bad attitude, doesn't he?" Harris asked as they continued on their way. "He's like this every night," the friend replied. "Then why are you still so polite to him?" Harris asked. The friend answered: "Why should I let him determine my behavior?"