It is not possible to express the most precious insights,
To see all that craves to be seen,
To visit even the closest neighbors in the universe,
To learn all that needs to be learned,
To live without dying,
And I am sad about it.
But I lived
And I am happy about that.

Dejan Stojanovic

http://www.poemhunter.com/poem/sadness-and-happiness-2/