“The Reformed Christian faith is a wealth of wisdom. It is impossible to cram the richness of Reformed doctrine into a five-point outline, however helpful outlines may be for introducing basic ideas. Merely surveying the headings of the Westminster Confession of Faith (1647) reveals the confluence of many streams of truth: Holy Scripture, God and the holy Trinity, God’s eternal decree, creation, providence, the fall of man into sin, God’s covenant with man, Christ the Mediator, free will, effectual calling, justification, adoption, sanctification, saving faith, repentance unto life, good works, the perseverance of the saints, assurance of grace and salvation, the law of God, Christian liberty and liberty of conscience, religious worship and the sabbath day, lawful oaths and vows, the civil magistrate, marriage and divorce, the church, the communion of saints, the sacraments of baptism and the Lord’s Supper, church censures, synods and councils, the state of men after death, the resurrection of the dead, and the last judgment.
When you add the rich expositions of living for God (the Ten Commandments) and depending on God (the Lord’s Prayer) found in the Reformed catechisms, it’s clear that Reformed truth encompasses ‘all the counsel of God’ that the faithful preacher must declare (Acts 20:27).”
~ Joel Beeke, Reformed Preaching