As a christian , even under grace it does matter what you do with your life. Don't waste your life is the message of God to us. We need to be gripped by the reality that choices we make have consequences both now and for eternity. Only our sins are forgiven and forever forgotten by God - wasted lives are not forgotten, rather they are remembered and dealt with by God at Christ's Bema Seat. Martin Luther lived by a motto he often repeated: "I have but two days in my calendar - Today, and the Day I stand before Christ."