English to French Translation

I am building a something and would like to put this phrase in French on it any help would be greatly appreciated.
"Within' this box contains the most precious possession i could give . . . . my heart, my everything."

Thanks Again!
Nick

"A l'intérieur, cette boîte contient la possession la plus précieuse que je puisse donner ... mon coeur, mon tout"

bonne chance !
Frank.
:cool: