So how do two people share a single heart?

No god whom men worship with a pure and single heart is wholly false.

Yet we know well that no magician's art Can keep our two selves near their single heart.

Then the voices rolled in together, as if the whole mob had taken on a single heart and voice.

I have cherished, in his presence, a single and upright heart.

A world with its motor cut off and a single heart, pumped by hand.

He loved with single heart and refused to cheapen himself or his love.

A single heart for all of my children; nobody can complain about that.

A single systemic heart then pumps the oxygenated blood through the rest of the body.

As far as I am concerned we share a single heart, whatever the outward appearances.