It's an old, old, old, antiquey hymn. My research says it was written over 300 years ago. "Come thou fount of every blessing, tune my heart to sing thy grace...."
The wording is so old school that I find it hard to undestand, no judging. But there is one line, in the final verse that make me bawl. "Bind my wandering heart to thee, prone to wander, Lord I feel it, prone to leave the God I love, here's my heart Lord, take and seal it..."
Just goes to show you that we as humans can have the best of intentions, but this world is fallen, and we as people are broken, so we are "prone to leave the God (we) love."