Door of miracles?

The door of miracles.

They always exist, just that we never noticed.
The key to the door of miracles, lie in our hearts.

Ask, and it shall be given.
Seek, and it shall be found.
Knock, and it shall be opened.

*Quote from Proposal Daisakusen Finale*

Knock knock at your heart;

knock knock at my heart

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Anybody home...?

*+ the sound of door opening... +*