no problems

our theologians in the Book of Concord, and by the norm of sound doctrine which is in it, testify that both our constant and perpetual opinion and that of this book is that with regard to the Lord’s Supper godly men should be led to no other foundations than to those of the words of institution of the testament of our Lord Jesus Christ. For since He is both almighty and true, it is easy for Him to do those things which He has both instituted and promised in His Word. -- Intro. to Book of Concord