Forgetfulness can be fatal. Sometimes, our forgetfulness has limited consequences (e.g. forgetting to wash our car). Other times, our forgetfulness has far greater consequences (e.g. forgetting to put gas in the car). But there’s a forgetfulness that has even more serious consequences. As Christians, we sometimes forget how spiritually dead we were before Christ gave us life.
Why is this so serious? When we forget how spiritually dead we were, we forget how desperate our condition was (which undermines humility), we forget how bad our future was (which undermines gratitude), and we forget how great God's life-giving power was (which undermines worship).
How do cure spiritual amnesia? Paul helps the Colossians and us by reminding us that we need spiritual resurrection as much as Christ’s resurrection.