The commands in the Bible are like a set of railroad tracks. The tracks provide no power for the train but the train must stay on the tracks in order to function. The law, in other words, never gives any power to do what it commands. It shows us what a sanctified life looks like but it has no sanctifying power. Only the gospel has power, as it were, to move the train. This is why the Bible never tells us what to do before first soaking our hearts and minds in what God in Christ has already done.