Westminster Confession Of Faith – Lord’s Day 34
Chapter 21 – Of Religious Worship and the Sabbath-day (Paragraphs 1-3)
I. The light of nature shows that there is a God, who has lordship and sovereignty over all; is good, and does good unto all; and is therefore to be feared, loved, praised, called upon, trusted in, and served with all the heart, and with all the soul, and with all the might. But the acceptable way of worshipping the true God is instituted by himself, and so limited by his own revealed will, that he may not be worshipped according to the imaginations and devices of men, or the suggestions of Satan, under any visible representation or any other way not prescribed in the holy Scripture.
II. Religious worship is to be given to God, the Father, Son, and Holy Ghost; and to him alone: not to angels, saints, or any other creature: and since the Fall, not without a Mediator; nor in the mediation of any other but of Christ alone.
III. Prayer with thanksgiving, being one special part of religious worship, is by God required of all men; and that it may be accepted, it is to be made in the name of the Son, by the help of his Holy Spirit, according to his will, with understanding, reverence, humility, fervency, faith, love, and perseverance; and, if vocal, in a known tongue.