The real outside is at the heart of the inside.

They may even be at the heart of the problem.

Cost is at the heart of the matter for the Government.

Their relationship is at the heart of a new film.

Here we begin to get at the heart of the matter.

Should international study be at the heart of higher education?

But women are at the heart of a city's trade.

And their future must be at the heart of every decision we take along the way.

What happened next is at the heart of the case.

For I knew nothing of the trouble at her heart.