by Scott D. Hendricks

Beware of supposing that this is merely ointment. For as the bread of the Eucharist, after the invocation of the Holy Spirit, is no longer simply bread, but the Body of Christ; so also this holy ointment is no longer merely ointment, not what one might call ordinary ointment, after the invocation; it is the gift of Christ, and by the presence of the Holy Spirit it conveys the power of his divinity. It is applied symbolically to the forehead and the other organs of sense; and while the body is anointed with the visible ointment, the soul is sanctified by the holy and life-giving Spirit.

~ St. Cyril of Jerusalem

Christopher A. Hall, Worshiping with the Church Fathers (Downers Grove: InterVarsity Press, 2009), 36.