Sometimes you want to focus people's attention on one specific issue or question. This is a good phrase for doing that:

I know that she's talented. The question is, is she ready to put in the work that it takes?

The question isn't whether or not we love each other. It's whether we're ready to make a lifelong commitment at our age.

The question is how much we're able to spend per month, and whether there are any apartments in that price range available in this neighborhood.