literally carved in the bones and engraved in the heart; used to describe feelings of gratitude or an experience that is etched in one's memory forever

etched into one's heart and bones; used to describe a deep memory or a feeling of gratitude that one will bear in mind forever

to remember something forever with deep gratitude; literally "to engrave on the bones and heart"

(idiom) engraved in one's heart and carved in one's bones; deeply memorable; to be forever remembered (often used to express undying gratitude)

(idiom) an ever-present memory; used to describe feelings, such as gratitude or resentment, that are impossible to forget