ENGLISH VOCABULARY - jobs

One thing I have understood in Life is, 1) If I think positive, I feel Good Immediately. 2)? If I think negative, I feel Bad Immediately. Then I analyzed, what? is Thinking? Answer I found was "Thinking is just a play of words, words & words" Think about the word "Problem" and "Challenge". Both say same thing, but the later feels good and former bad. Infact, I am using a iPhone called "iVocab" by Lokesh Hanumappa which helps me in a terrrifc way to learn words and track feelings of the words.

very interesting.I like it very much?

WAo I like it? very much. Thanks