But beware of supposing that this is ordinary ointment. For just as the Bread of the Eucharist after the invocation of the Holy Spirit is simple bread no longer, but the Body of Christ, so also this holy ointment is no longer plain ointment, nor, so to speak, common, after the invocation. Rather, it is the gracious gift of Christ; and it is made fit for the imparting of His Godhead by the coming of the Holy Spirit. This ointment is symbolically applied to your forehead and to your other senses; and while your body is anointed with the visible ointment, your soul is sanctified by the holy and life-creating Spirit.
— Saint Cyril of Jerusalem (c. 313-386)