Gerhard and Walther

Consequently, just as the faithful and unfailing promises of God should implant and strengthen child-like faith in us, so also His faithful unchanging threats can and should implant and strengthen within us the child-like fear of God in us. Out of these two chief sources—namely, out of child-like confidence and fear of God—springs forth true godliness.—Johann Gerhard, Schola Pietatis, I:148. 

God did not choose the elect because He knew they would remain in faith; instead, their election is the reason they persevere in believing. God did not choose them because He knew they would be saved; rather, they will be saved because they were elected.—C. F. W. Walther, God Grant It!, p. 198.