Institutes of the Christian Religion
Calvin's four-book theological architecture joins knowledge of God, knowledge of ourselves, doctrine, worship, and the life of the church.
Read the original sourceThe Institutes rewards reading as a whole architecture rather than as a source of detached quotations. Its four books follow the broad movement of the Apostles' Creed: God the Creator, Christ the Redeemer, the Spirit's work, and the church's life.
The linked edition is the nineteenth-century Henry Beveridge translation. That makes the text widely accessible, but translation and edition still matter. When a disputed phrase carries substantial weight, the responsible next step is to compare a modern critical translation or the Latin—not to make the public-domain wording do more than it can support.