Someone told me that life is like a box of chocolates that is full of different surprises. You never know what you are going to get next. And from a very Chinese philosophy aspect, you can always learn from what happened to you, no matter good or bad. When you take the ownership of your self-learning and improvement, no one can stop you from being stronger!

That is why life is always fascinating. 

People succeed because they tried. Likewise, we haven't gotten there yet because we haven't tried hard enough.

Keep dreaming, keep trying, and keep learning. :) 
You will see, life is boring without any challenge and up & downs :P