Note 1 — Chapter IV

St. Leo defines a Sacrament thus: "Sacramentum. (1) It originally signified the pledge or deposit in money which in certain suits according to Roman Law plaintiff and defendant were alike bound to make; (2) it came to signify a pledge of military fidelity, a voluntary oath; (3) then the exacted oath of allegiance; (4) any oath whatever; (5) in early Christian use any sacred or solemn act, and especially any mystery where more was meant than met the ear or eye" (Blight's "Select Sermons of St. Leo on the Incarnation," p. 136).