"Chance is the one thing you can't buy. You have to pay for it and you have to pay for it with your life, spending a lot of time, you pay for it with time, not the wasting of time but the spending of time."
- Robert Doisneau

"Chance favors the prepared mind.“
– Louis Pasteur

"What is luck? It is not only chance, it is also creating the opportunity, recognizing it when it is there, and taking it when it comes."
- Natasha Josefowitz

From the song 'Taking a Chance' by Whitney Houston:

There's a chance that maybe in this life I'll find
True love and peace of mind,
There's a chance that maybe I can reach my goal
And soar to the other side,
Good things come to those who wait,
I'm just afraid that I might sit here and wait too late, so...

I'm taking a chance on loving you,
No matter the price I'll pay my dues,
I'm taking a chance on loving you,
They tell me I'm crazy.

There's a chance that maybe once I could be wrong,
But wrong never felt so right,
There's a chance that maybe I'm risking much too soon,
But our hearts just fell in tune.

http://www.youtube.com/watch?v=TyLd3l3r29E

From the song 'Only Time' by Enya:

Who can say where the road goes,
Where the day flows, only time,
And who can say if your love grows,
As your heart chose, only time.

http://www.youtube.com/watch?v=7wfYIMyS_dI