God describes himself as holy. Holy means perfect, set apart, free from evil. And God wants us to follow his example. The only way to holiness is through spiritual transformation, becoming like the only perfect human—Jesus Christ.
Because God is holy, we should be and can be holy. We could never do this on our own—only through Christ’s work in us. If holiness seems too lofty a goal, think of it as a process. You became holy when you accepted Christ’s sacrifice on the cross. You are becoming more holy as you follow him. And you will become completely holy when you reach heaven.