The ''Enchiridion'' is a compact treatise on Christian piety, written in response to a request by an otherwise unknown person, named Laurentius, shortly after the death of Saint Jerome in 420. It is intended as a model for Christian instruction or catechesis. As the title indicates, the work is organized according to the three graces necessary for the Christian worship of God: Faith, Hope and Love. This edition contains nearly 300 linked footnotes.