set one’s heart on something/ have your heart set on something
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So if you have got your heart set on a big wedding for the kids or a fast car when you retire, it is worth putting some money away.
Now there was once a Queen, who might have been thought to have everything she could desire in the world, but had set her heart on a strange silent bird a traveler had told of, which lived in the snowy mountains.
To help you afford the house you've set your heart on, choose either our low start or deferred payment options - these will make buying your home easier. (BNC-B)