What are atahe words to poem from The Fantasticks that begins it is a curious paradox that no one can explain?

There is a curious paradox that no one can explain. Who understands the secrets of the reaping of the grain?
Who understands why spring is born from winter's laboring pain?
Or why we all must die a bit before we grow again?


I do not know the answer
I merely know it's true
I hurt them for that reason,
And myself a little bit too.