The Flip-Flop theory

How has your life been? has everything been good? or bad? To me, it has been fluctuating. I mean it's a series of good or bad things. In fact, I'm not sure whether it's true or not, but I really want to believe that it is true. I saw a credo, the 50% theory of life. The author said that half the time things are better than normal; the other half, they are worse. Well...normal things are also available in our lives, but the important thing is even if we were in terrible situation, we could expect us to be in good situation in the future. On the other hand, even if we were in good situation, it could be also possible that we would be in bad situation. I think that this fact makes us have hopes and prevent us from being lazy at least to me. Actually, I has thought about this theory since when I was in highschool. This theory has made me think or worry a lot about my future. I'm not sure if it's good or not, but it's true that this theory helped me a lot.