from the bottom of my heart
Je l'ai remercié du fond du cœur.
I thanked him from the bottom of my heart.
Je vous parle du fond du cœur.
I’m speaking to you from the bottom of my heart.
— L'Orphelinat (2007)
Thank you from the bottom of my heart!
Thank you from the bottom of my heart.
Je vous adore tous du fond du cœur.
I love you all with all my heart.
— Le Loup de Wall Street (2013)
I love him/her with all my heart.
I mean it from the bottom of my heart.