At first it is talking about how it's having remorse for turning our world into a dark place; the singing I assume is an attempt at redeeming ourselves from the darkness. When it talks about being "Built to last" that is talking about how God's love was built to last and that He will carry us out of our cold and dark times. "Swing low, Sweet chariot" was a song sung by slaves in the 1800's and they sang it for a couple reasons; one was to figure out who was a part of the underground railroad but it was also a prayer asking God and the angels, who is talked about somewhere in the bible as riding a chariot, to save them from their misery which I assume is used for the same purpose. "Riding till sunset" is meant to say flee from the darkness and leave behind your sins. Finally when it talks about life ending and beginning at the same time it's talking about Matthew 16:24-25. Jesus tells us to die to ourselves (which is just a morbid expression of putting your life with God before your own wants and needs) and we would have new life. Also, many people accept Christ into their hearts mutiple times, repenting past sins and asking God to take over, that's why it says "Again and again."
At first it is talking about how it's having remorse for turning our world into a dark place; the singing I assume is an attempt at redeeming ourselves from the darkness. When it talks about being "Built to last" that is talking about how God's love was built to last and that He will carry us out of our cold and dark times. "Swing low, Sweet chariot" was a song sung by slaves in the 1800's and they sang it for a couple reasons; one was to figure out who was a part of the underground railroad but it was also a prayer asking God and the angels, who is talked about somewhere in the bible as riding a chariot, to save them from their misery which I assume is used for the same purpose. "Riding till sunset" is meant to say flee from the darkness and leave behind your sins. Finally when it talks about life ending and beginning at the same time it's talking about Matthew 16:24-25. Jesus tells us to die to ourselves (which is just a morbid expression of putting your life with God before your own wants and needs) and we would have new life. Also, many people accept Christ into their hearts mutiple times, repenting past sins and asking God to take over, that's why it says "Again and again."