Be careful, it’s my heart,
It’s not my watch you’re holding, it’s my heart.
It’s not the note I sent you that you quickly burned,
It’s not the book I lent you that you never returned.
Remember, it’s my heart,
The heart with which so willingly I part.
It’s yours to take, to keep or break,
But please, before you start,
Be careful, it’s my heart.
Irving Berlin, “Be Careful, It’s My Heart” (music by Berlin, courtesy of Marc Myers)