From the Preface:
  The title-page of this treatise declares that it was written 'to repel the
  attacks of Pastor Grabau of Buffalo, N.Y.' However, the scope of Walther's
  effort extended beyond Pastor Grabau and the Buffalo Synod.
  The earliest Lutheran organizations in America were not called 'synods' but
  'ministeria.' To their conventions laymen might be brought along by their
  pastors, but they had no determining voice in the deliberations of their
  church-body. (Like in) the great national Lutheran churches of Europe...the
  rights of layman to direct their own church affairs, except in a few isolated
  instances, were ignored by common consent or openly denied.
  Pastor Grabau's ideal 'Church' had so much in common with the existing
  Lutheran church-bodies at that time that an attack upon his organization was
  really a challenge to all the Lutheran ministeria in America and all the
  national Lutheran churches of Europe. They were all hierarchically oriented
  and ingrained. What Walther attempted by his treatise was something unheard of
  since Luther and the early days of the Reformation. It was throwing down the
  gauntlet to every type of arrogant Lutheran clericalism throughout the world.
  Walther regarded the denial of the personal right of self-decision in
  religious matters to the humblest believer in Christ and of his supreme
  authority in the Church as wicked arrogance. He championed the rights of the
  Christian with his treatise on the  Church and the Ministry.
  The draft of the treatise was submitted in 1851 to the Fifth Convention of
  the Missouri Synod at Milwaukee, Wisconsin, and discussed in eight sessions.
  Unanimously the convention voted its enthusiastic approval of Walther's effort
  and ordered its publication. During a visit at Erlangen that same year Walther
  engaged the well-known firm of Andreas Deichert for this work, and from their
  presses the first edition of the treatise was issued in 1852.
  
  
  
  Theses on the Church
  THESIS I
  The Church, in the proper sense of the term, is the communion of saints,
  that is, the sum total of all those who have been called by the Holy Spirit
  through the Gospel from out of the lost and condemned human race, who truly
  believe in Christ, and who have been sanctified by this faith and incorporated
  into Christ.
  THESIS II
  To the Church in the proper sense of the term belongs no godless person, no
  hypocrite, no one who has not been regenerated, no heretic.
  THESIS III
  The Church, in the proper sense of the term, is invisible.
  THESIS IV
  This true Church of believers and saints it is to which Christ has given
  the keys of the kingdom of heaven. Therefore this Church is the real and sole
  holder and bearer of the spiritual, divine, and heavenly blessings, rights,
  powers, offices, etc., which Christ has gained and which are available in His
  Church.
  THESIS V
  Although the true Church, in the proper sense of the term, is invisible as
  to its essence, yet its presence is perceivable, its marks being the pure
  preaching of the Word of God and the administration of the holy Sacraments in
  accordance with their institution by Christ.
  THESIS VI
  In an improper sense the term "Church," according to Holy
  Scripture, is applied also to the visible sum total of all who have been
  called, that is, to all who profess allegiance to the Word of God that is
  preached and make use of the holy Sacraments. This Church (the universal
  [catholic] Church) is made up of good and evil persons. Particular divisions
  of it, namely, the congregations found here and there, in which the Word of
  God is preached and the holy Sacraments are administered, are called churches
  (particular churches), for the reason, namely, that in these visible groups
  the invisible, true Church of the believers, saints, and children of God is
  concealed, and because no elect persons are to be looked for outside of the
  group of those who have been called.
  THESIS VII
  Even as the visible communions in which the Word and the Sacraments still
  exist in their essence bear, according to God's Word, the name of CHURCHES
  because of the true invisible Church of the true believers contained in them,
  so likewise they, because of the true, invisible Church concealed in them,
  though there be but two or three, possess the POWER which Christ has
  given to His entire Church.
  THESIS VIII
  While God gathers for Himself a holy Church of the elect in places where
  the Word of God is not preached in entire purity and the holy Sacraments are
  not administered altogether in accordance with their institution by Jesus
  Christ, -- provided the Word of God and the Sacraments are not utterly denied
  but essentially remain in those places, -- still every one is obliged, for the
  sake of his salvation, to flee from all false teachers and to avoid all
  heterodox churches, or sects and, on the other hand, to profess allegiance,
  and adhere, to orthodox congregations and their orthodox preachers wherever he
  finds such.
  A. Also in erring, heretical congregations there are children of God; also
  in them the true Church becomes manifest by means of the remnants of the pure
  Word of God and the Sacraments that still remain in them.
  B. Every one is obliged, for the sake of his salvation, to flee all false
  prophets and to avoid fellowship with heterodox churches, or sects.
  C. Every Christian is obliged, for the sake of his salvation, to profess
  allegiance, and adhere, to orthodox congregations and their orthodox preachers
  wherever he finds such.
  THESIS IX
  The only indispensable requisite for obtaining salvation is fellowship with
  the invisible Church, to which all those glorious promises that concern the
  Church were originally given.
  
  
  
  Theses on the Ministry
  THESIS I
  The holy ministry, or the pastoral office, is an office distinct from the
  priestly office, which belongs to all believers.
  THESIS II
  The ministry, or the pastoral office, is not a human ordinance, but an
  office established by God Himself.
  THESIS III
  The ministry of preaching is not an arbitrary office, but its character is
  such that the Church has been commanded to establish it and is ordinarily
  bound to it till the end of days.
  THESIS IV
  The ministry of preaching is not a peculiar order, set up over and against
  the common estate of Christians, and holier than the latter, like the
  priesthood of the Levites, but it is an office of service.
  THESIS V
  The ministry of preaching has the authority to preach the Gospel and to
  administer the Sacraments and the authority of a spiritual tribunal.
  THESIS VI
  The ministry of preaching is conferred by God through the congregation, as
  holder of all church power, or of the keys, and by its call, as prescribed by
  God. The ordination of those called, with the laying on of hands, is not by
  divine institution but is an apostolic church ordinance and merely a public,
  solemn confirmation of the call.
  THESIS VII
  The holy ministry is the authority conferred by God through the
  congregation, as holder of the priesthood and of all church power, to
  administer in public office the common rights of the spiritual priesthood in
  behalf of all.
  THESIS VIII
  The ministry is the highest office in the Church, from which, as its stem,
  all other offices of the Church issue.
  THESIS IX
  Reverence and unconditional obedience is due to the ministry of preaching
  when the preacher is ministering the Word of God. However, the preacher may
  not dominate over the Church; he has, accordingly, no right to make new laws,
  to arrange indifferent matters and ceremonies arbitrarily, and to impose and
  execute excommunication ALONE, without a previous verdict of the entire
  congregation.
  THESIS X
  According to divine right the function of passing judgment on doctrine
  belongs indeed to the ministry of preaching. However, also the laymen have
  this right, and for this reason they also have a seat and vote with the
  preachers in church courts and councils.