From the Scots Confession
Chapter 22 -
The Right Administration of the Sacraments
Two things are necessary for the right administration of the sacraments. The first is that they should be ministered by lawful ministers, and we declare that these are men appointed to preach the Word, unto whom God has given the power to preach the gospel, and who are lawfully called by some Kirk*. The second is that they should be ministered in the elements and manner which God has appointed. Othewise they cease to be the sacraments of Christ Jesus. This is why we abandon the teaching of the Roman Church and withdraw from its sacraments; firstly, because their ministers are not true ministers of Christ Jesus (indeed they even allow women, whom the Holy Ghost will not permit to preach in the congregation to baptize) and, secondly, because they have so adulterated both the sacraments with their own additions that no part of Christ's original act remains in its original simplicity. The addition of oil, salt, spittle, and such like in baptism, are merely human additions. To adore or venerate the sacrament, to carry it through streets and towns in procession, or to reserve it in a special case, is not the proper use of Christ's sacrament but an abuse of it. Christ Jesus said, "Take ye, eat ye," and "Do this in remembrance of Me." By these words and commands he sanctified bread and wine to be the sacrament of his holy body and blood, so that the one should be eaten and that all should drink of the other, and not that they should be reserved for worship or honored as God, as the Romanists do. Further, in withdrawing one part of the sacrament--the blessed cup--from the people, they have committed sacrilege. Moreover, if the sacraments are to be rightly used it is essential that the end and purpose of their institution should be understood, not only by the minister but also by the recipients. For if the recipient does not understand what is being done, the sacrament is not being rightly used, as is seen in the case of the Old Testament sacrifices. Similarly, if the teacher teaches false doctrine which is hateful to God, even though the sacraments are his own ordinance, they are not rightly used, since wicked men have used them for another end than what God had commanded. We affirm that this has been done to the sacraments in the Roman Church, for there the whole action of the Lord Jesus is adulterated in form, purpose, and meaning. What Christ Jesus did, and commanded to be done, is evident from the Gospels and from St. Paul; what the priest does at the altar we do not need to tell. The end and purpose of Christ's institution, for which it should be used, is set forth in the words, "Do this in remembrance of Me," and "For as often as ye eat this bread and drink this cup ye do show"--that is, extol, preach, magnify, and praise--"the Lord's death, till He come." But let the words of the mass, and their own doctors and teachings witness, what is the purpose and meaning of the mass; it is that, as mediators between Christ and his Kirk, they should offer to God the Father, a sacrifice in propitiation for the sins of the living and of the dead. This doctrine is blasphemous to Christ Jesus and would deprive his unique sacrifice, once offered on the cross for the cleansing of all who are to be sanctified, of its sufficiency; so we detest and renounce it.
* By kirk they mean church, according to the Oxford English Dictionary "the term `kirk' has often been opposed to `church' to distinguish the Church of Scotland from the Church of England, or from the Episcopal Church in Scotland".