Of the Discipline of the Church, and Its Principal Use in Censures and Excommunication.
1. Of the power of the keys, or the common discipline of the Church. Necessity and very great utility of this discipline. 2. Its various degrees. 1. Private admonition. 2. Rebukes before witnesses. 3. Excommunication. 3. Different degrees of delinquency. Modes of procedure in both kinds of chastisement. 4. Delicts to be distinguished from flagitious wickedness. The last to be more severely punished. 5. Ends of this discipline. 1. That the wicked may not, by being admitted to the Lord's Table, put …
John Calvin—The Institutes of the Christian Religion

Of the Public Fast.
A public fast is when, by the authority of the magistrate (Jonah iii. 7; 2 Chron. xx. 3; Ezra viii. 21), either the whole church within his dominion, or some special congregation, whom it concerneth, assemble themselves together, to perform the fore-mentioned duties of humiliation; either for the removing of some public calamity threatened or already inflicted upon them, as the sword, invasion, famine, pestilence, or other fearful sickness (1 Sam. vii. 5, 6; Joel ii. 15; 2 Chron. xx.; Jonah iii. …
Lewis Bayly—The Practice of Piety

Of a Private Fast.
That we may rightly perform a private fast, four things are to be observed:--First, The author; Secondly, The time and occasion; Thirdly, The manner; Fourthly, The ends of private fasting. 1. Of the Author. The first that ordained fasting was God himself in paradise; and it was the first law that God made, in commanding Adam to abstain from eating the forbidden fruit. God would not pronounce nor write his law without fasting (Lev. xxiii), and in his law commands all his people to fast. So does our …
Lewis Bayly—The Practice of Piety