To reject the promise that sins are freely forgiven for Christ's sake is to abolish the Gospel...

In order for the subject to be made quite clear, we have shown well enough so far, both from testimonies of Scripture and arguments derived from Scripture, that we receive forgiveness of sins for Christ's sake through faith alone.  We have shown that through faith alone we are justified, that is, unrighteous people are made righteous, or regenerated.  How necessary the knowledge of this faith is can be easily judged.  Because Christ's office is recognized in this alone, we receive Christ's benefits by this alone.  Only this teaching brings sure and firm consolation to pious minds.  In the Church there must be teaching by which the pious may receive the sure hope of salvation.  For the adversaries give people bad advice when they tell them to doubt whether they receive forgiveness of sins.  How will such persons sustain themselves in death who have heard nothing of this faith and think that they ought to doubt whether they receive forgiveness of sins?  Besides, it is necessary that the Gospel be kept in Christ's Church, namely, the promise that sins are freely forgiven for Christ's sake.  Those who teach nothing of this faith we speak about, completely abolish the Gospel.  But the Scholastics mention not even a word about this faith. Our adversaries follow them and reject this faith.  Nor do they see that by rejecting this faith they abolish the entire promise about the free forgiveness of sins and the righteousness of Christ.
~BOC, AP, IV (II), 117-121.

Christ makes Himself present in the Lord's Supper not by our faith, but by His almighty power...

It is not our faith that makes the Sacrament, but only the true Word and institution of our almighty God and Savior, Jesus Christ.  His Word always is and remains effective in the Christian Church.  It is not invalidated or rendered ineffective by the worthiness or unworthiness of the minister, nor by the unbelief of the one who receives it.  This is just like the Gospel.  Even though godless hearers do not believe it, the Gospel is and remains nonetheless the true Gospel, only it does not work for salvation in the unbelieving.  So whether those who receive the Sacrament believe or do not believe, Christ remains nonetheless true in His words when He says, "Take, eat; this is My body."  He makes Himself present not by our faith, but by His almighty power.
~BOC, FSD, VII, 89

We must not enact traditions, in addition to the Gospel, as if they are acts of forgiveness or righteousness...

We must keep in the Church the doctrine that we receive the forgiveness of sins freely for Christ's sake, through faith.  We must also keep the doctrine that human traditions are useless services and, therefore, neither sin nor righteousness should be placed in meat, drink, clothing, and like things.  Christ wished the use of such things to be left free, since He says, "It is not what goes into the mouth that defiles a person" (Matthew 15:11); and Paul says, "The kingdom of God is not a matter of eating and drinking" (Romans 14:17).  Therefore, the bishops have no right to enact traditions in addition to the Gospel, so that people must merit the forgiveness of sins, or that they think are services that God approves as righteousness. They must not burden consciences (as though it were a sin to leave such observances undone).  All this is taught by that one passage in Acts 15:9, where the apostles (Peter) say that hearts are cleansed through faith.  Then they prohibit the imposing of a yoke and show how great a danger this is, and multiply the sin of those who burden the Church.  "Why do you tempt God?" they say.  Our adversaries are not terrified even by this thunderbolt.  They defend traditions and godless opinions with violence.
~BOC, AP, XXVIII (XIV), 7-8

Offerings are for the benefit of the Church...

They themselves should remember that riches have been given to bishops as alms for the administration and advantage of the churches. As the rule says, "The benefit is given because of the office." Therefore, they cannot with a good conscience possess these alms and defraud the Church.  The Church has need of this money to support ministers, aid education, care for the poor, and establish courts, especially for marriage   So great is the variety and extent of marriage controversies that there is need for a special court, for which the endowments of the church are needed.  Peter predicted that there would be godless bishops who would abuse the alms of the Church for luxury and neglect the ministry.  Therefore, let those who defraud the Church know that they will pay God the penalty for this crime.
~BOC, PPP, 79-82

The authority to administer the Gospel lies with the Church....

Wherever the Church is, there is the authority to administer the Gospel.  Therefore, it is necessary for the Church to retain the authority to call, elect, and ordain ministers.  This authority is a gift that in reality is given to the Church.  No human power can take this gift away from the Church.  As Paul testifies to the Ephesians, when "He ascended...He gave gifts to men" (Ephesians 4:8).  He lists among the gifts specifically belonging to the church "pastors and teachers" (4:11), and adds that they are given for the ministry, "for the building up of the body of Christ" (4:12).  So wherever there is a True Church, the right to elect and ordain ministers necessarily exists.  In the same way, in a case of necessity even a layman absolves and becomes the minister and pastor of another.  Augustine tells the story of two Christians in a ship, one of whom baptized the catechumen, who after Baptism then absolved the baptizer.
~BOC, PPP, 67

The Church is those who hear the voice of their Shepherd...

We do not agree with them that they are the Church.  They are not the Church.  Nor will we listen to those things that, under the name of Church, they command or forbid.  Thank God, today a seven-year-old child knows what the Church is, namely, the holy believers and lambs who hear the voice of their Shepherd.  For the children pray, "I believe in one holy Christian Church."  This holiness does not come from albs, tonsures, long gowns, and other ceremonies they made up without Holy Scripture, but from God's Word and true faith.
~BOC, SA, III, XII, 1-3

The Holy Spirit bestows, increases, and strengthens faith as He makes us holy as we abide in faith...

But the Holy Spirit carries on His work without ceasing to the Last Day.  For that purpose He has appointed a congregation upon earth by which He speaks and does everything.  For He has not yet brought together all His Christian Church or granted all forgiveness.  Therefore, we believe in Him who daily brings us into the fellowship of this Christian Church through the Word. Through the same Word and the forgiveness of sins He bestows, increases, and strengthens faith.  So when He has done it all, and we abide in this and die to the world and to all evil, He may finally make us perfectly and forever holy.  Even now we expect this in faith through the Word.
~BOC, LC, II, 61-62

Everything in the Christian Church is ordered toward this goal...

We further believe that in this Christian Church, we have forgiveness of sin, which is wrought through the holy Sacraments and Absolution and through all kinds of comforting promises from the entire Gospel.  Therefore, whatever ought to be preached about the Sacraments belongs here.  In short, the whole Gospel and all the offices of Christianity belong here, which also must be preached and taught without ceasing.  God's grace is secured through Christ, and sanctification is wrought by the Holy Spirit through God's Word in the unity of the Christian Church.  Yet because of our flesh, which we bear about with us, we are never without sin.

Everything, therefore, in the Christian Church is ordered toward this goal: we shall daily receive in the Church the forgiveness of sin through the Word and the signs, to comfort and encourage our consciences as long as we live here.  So even though we have sins, the grace of the Holy Spirit does not allow them to harm us, for we are in the Christian Church, where there is nothing but continuous, uninterrupted forgiveness of sins.  This is because God forgives us and because we forgive, bear with, and help one another.
~BOC, LC, II, 54-55