It comes and goes as it decides
No matter what you say.
It seems the more you want it near,
The more it goes away.

And then when you are quite content
To sit out in the sun
Alone with just your thoughts and dreams,
Not needing anyone,

Out it comes, as if in fear
That somehow you’ll forget,
And jumps up purring in your lap,
Demanding to be pet.

poem from http://www.poemsforfree.com