That's the thing. It's called challenge, like a dare that says you can by telling you you can't. I don't know if your getting it but what I'm trying to say is that, there is no part of the word challenge that says, your never going to over come this. Challenges are rather a motivation, a bumpy part that leads to even greater heights and as well, it stands to be a barrier for those that don't have the qualities and potential to attain and sustain that greatet height because, even when attained, it could also drag you down.
I don't agree with the fact that, challenges do come and go. I believe they are always there to stay, watching to pull you down with your slightest mistake. You've just got to know that behind every challenge lies your dreams. So, you've just got to overcome.