The Greek douleia in Scripture refers to service or bondage -- never to a graded system of religious veneration. Paul uses the word to describe bondage to sin and the law: "You did not receive the spirit of slavery (douleias) to fall back into fear" (Romans 8:15). The biblical concept of doulos (servant/slave) is applied to believers' relationship to Christ, not to the veneration of other creatures. Scripture nowhere commands or models the veneration of dead saints. When men attempted to worship angels or apostles, they were rebuked: "You must not do that! I am a fellow servant... Worship God" (Revelation 22:9). The entire dulia/latria distinction is a medieval construction designed to justify practices that Scripture forbids.
Webster 1828 does not contain an entry for "dulia."
The absence of this term from Webster's 1828 dictionary is notable. As a technical term of Roman Catholic scholastic theology, it had no currency in Protestant English-language usage. Webster, a devout Congregationalist, would not have recognized the dulia/latria distinction as legitimate theology.
• Romans 8:15 — "For you did not receive the spirit of slavery to fall back into fear, but you have received the Spirit of adoption as sons."
• Revelation 22:8-9 — "I fell down to worship at the feet of the angel... He said, 'You must not do that!... Worship God.'"
• Acts 10:25-26 — "When Peter entered, Cornelius... fell down at his feet and worshiped him. But Peter lifted him up, saying, 'Stand up; I too am a man.'"
• Colossians 2:18 — "Let no one disqualify you, insisting on asceticism and worship of angels."
The dulia/latria distinction provides theological cover for what Scripture calls idolatry.
Roman Catholic theology developed the dulia/latria distinction to defend the practice of praying to saints, bowing before their images, and processing their relics. The argument is that "veneration" (dulia) is categorically different from "worship" (latria), and therefore praying to Mary or the saints does not violate the First Commandment. But Scripture makes no such distinction. Every instance of a human or angel receiving religious devotion in the Bible results in immediate correction. Peter refused it. Paul refused it. Angels refused it. The distinction is a philosophical invention that contradicts the uniform testimony of Scripture: religious devotion belongs to God alone.
• "The dulia/latria distinction is a theological escape hatch -- if Peter and the angels refused veneration, no dead saint would accept it either."
• "When Rome speaks of 'venerating' saints while 'worshiping' God alone, they draw a line that Scripture refuses to draw."