Life is like a sinusoid..no??? Box of chocolates??  Never mind. Nobody knows the future.  Nobody was given the handbook on how to live life. 

Here's a fable that I really enjoy.  I first heard Eckhart Tolle tell it.  I'm copying it from Derek Siver's blog.

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A farmer had only one horse.  One day, his horse ran away.
All the neighbors came by saying, “I'm so sorry. This is such bad news. You must be so upset.”   The man just said, “We'll see.”
A few days later, his horse came back with twenty wild horses.  The man and his son corraled all 21 horses.
All the neighbors came by saying, “Congratulations! This is such good news. You must be so happy!”   The man just said, “We'll see.”
One of the wild horses kicked the man's only son, breaking both his legs.
All the neighbors came by saying, “I'm so sorry. This is such bad news. You must be so upset.”   The man just said, “We'll see.”
The country went to war, and every able-bodied young man was drafted to fight. The war was terrible and killed every young man, but the farmer's son was spared, since his broken legs prevented him from being drafted.
All the neighbors came by saying, “Congratulations! This is such good news. You must be so happy!”   The man just said, “We'll see.”