The song expresses an eternal emotion that can't be given up, as if this yearning will be engraved in my heart forever, which can't be forgotten and put down. This kind of emotion usually comes from the loss of an important person or the deep yearning and memory afterwards.
Generally speaking, the song "There is a kind of yearning forever" expresses a deep and lasting yearning and emotional bond for a person. This yearning, like eternal care and waiting, closely connects the author with that person. No matter how time passes, this yearning will last forever and become an inseparable part of their lives.