C.F.W. Walther was the first president of the Lutheran Church – Missouri Synod. He also was the founder and president of the Concordia Seminary in St. Louis, MO. Near the end of his life, Walther gave a series of Friday evening lectures from 1884-1885 at Concordia Seminary. The 29 evening lectures gave forth 25 theses on the proper distinction of Law and Gospel. These lectures are now compiled in a books known as Law and Gospel. These 25 theses on Law and Gospel are still instrumental in guiding Lutheran pastors in how to read and apply God’s Word, as Walther’s work is still used in the curriculum of the LC-MS seminaries (as well as undergrad Concordia Universities). The proper distinction of Law and Gospel is not just for called and ordained pastors however, it’s truly for every Christian, even if you’re not Lutheran.
Below is a video series in which I summarize these theses:
Theses 1-4 – https://youtu.be/tcW0_0y_Koo
Theses 5-9 – https://youtu.be/PqQxpaWDD4U
Theses 10-14 – https://youtu.be/mOw91ihnnEI
Theses 15-20 – https://youtu.be/69zfrXKozXY
Theses in Practice – https://youtu.be/MyYm8pKwpMI
Theses 21-25 – https://youtu.be/mrMJ49NWPqQ
Andy Wrasman 
Published by