Gerhard and Walther

Is faith created in the heart through Holy Baptism? Aha! Well then, we must also show our faith by works if really want to be certain that we received faith through Holy Baptism. For through faith the heart is cleansed, Acts 15:9, so that also pure fine works flow forth from such a pure font. Where such works do not manifest themselves, there a person boasts about his Baptism in vain.—Johann Gerhard, Schola Pietatis I:95.

God does not tire of doing good to us, and we must not tire of doing good to our brothers.—C. F. W. Walther, God Grant It!, p. 104.