Even though God is holding onto us, we are to hold onto him at the same time. We are capable of losing our grip, and indeed we do so. We have a responsibility to hold on as tightly as we can, even though we are sure he will not let us go. The New Testament frequently admonishes us to do this and wants us of the consequences of letting go. We can fall from grace, but not absolutely. At times Scripture seems to forbid what is ultimately impossible and to command what is also impossible. For example, it calls us to be perfect as our heavenly Father is perfect (Matthew 5:48). No one can reach this degree of perfection. Why then does Scripture speak in this manner? Luther called this the “evangelical usage of the law.” He meant that the gospel calls us to strive as diligently as we can to meet the highest standards of the law. Such calls drive us to an ever-increasing dependence on grace.
Sproul, R.C.; Grace Unknown: The Heart of Reformed Theology; Baker Books; Grand Rapids, MI; copyright 1997; p. 213