Gerhard and Walther

For we cannot at first glance immediately grasp the Holy Scriptures with a hurried reading of it. Instead, we have to make it well known to us and become very familiar with it. The very Majesty and Glory of the Holy Scriptures requires this. For in them are hidden such heavenly and godly mysteries about which we in this our entire lifetime shall never to be able to completely finish learning. The tiniest letter and tittle in God’s Word is full of heavenly wisdom and salutary doctrine.—Johann Gerhard, Schola Pietatis I:41. 

Receiving Christ’s body and blood in remembrance of Him, then, means that they are consumed both with the mouth and spiritually. In a words, they are eaten in faith.—C. F. W. Walther, God Grant It!, p. 331.