'fullness of heart' is correct and usable in written English.
You can use it in sentences where you wish to express love or joy. For example: She felt a fullness of heart that could bless the world.
Barbara Frittoli's Leonora, sung with Mozartean transparency and fullness of heart, took wing to Mr. Muti's yearning, newly flexible accompaniment.
There was suffering (again Tchaikovsky) and despair (Mussorgsky), but both were born with a fullness of heart.
She continued, "Smart, compassionate, witty, courageous, this one not only dares to ask the hard questions... but asks them with humor, exquisite clarity and great fullness of heart".
I feel this system is a viable alternative for those who, while not inclined to become contortionists, seek vibrant health along with peace of mind and fullness of heart.
What if that moment of thankfulness and fullness of heart wasn't so brief?
This light -- the light of the sun -- can inspire you to experience reverence, joy, peace, and a fullness of heart.
In the words of Kaine: "From the fullness of the heart, the mouth speaks... Donald Trump is showing you who he is".
"There are no words to express the fullness of my heart when I wish you success, but I know you will understand and words are unnecessary," she wrote to him in 1934 on the opening night of "Life Begins at 8 40".
From the fullness of the heart, the mouth speaks.
"The real work is how not to hang your self-worth, your sense of success and merits, the fullness of your heart, and the stability of your soul on those numbers - on that constant positive reinforcement and external validation.
