Gerhard and Walther

Since the Judge will reward every individual according to his works, we must busy ourselves from the heart with good works, so that we at that time shall receive a reward of grace and not a wrathful punishment.—Johann Gerhard, Schola Pietatis I:237.

Because God alone can convert us, fear and trembling should be in us so that we do not hinder the working of God’s Word in us.—C. F. W. Walther, God Grant It!, p. 257.