for; for the purpose of; in order to

The lions fought with each other to get food.

The poor young man finally became a great artist.

They set out with a guide just in case they lost their way.

You must put an end to this foolish behavior.

And I know you didn't do this just to win an election. And I know you didn't do it for me. You did it because you understand the enormity of the task that lies ahead. For even as we celebrate tonight, we know the challenges that tomorrow will bring are the greatest of our lifetime: two wars, a planet in peril, the worst financial crisis in a century.