7 Keep This unspotted: for it shall teach you all things, if it abide in you, as you have just heard declared by the blessed John, discoursing much concerning this Unction. For this holy thing is a spiritual safeguard of the body, and salvation of the soul. Of this the blessed Esaias prophesying of old time said, And on this mountain,— (now he calls the Church a mountain elsewhere also, as when he says, In the last days the mountain of the Lord's house shall be manifest;)— on this mountain shall the Lord make unto all nations a feast; they shall drink wine, they shall drink gladness, they shall anoint themselves with ointment. And that he may make you sure, hear what he says of this ointment as being mystical; Deliver all these things to the nations, for the counsel of the Lord is unto all nations. Having been anointed, therefore, with this holy ointment, keep it unspotted and unblemished in you, pressing forward by good works, and being made well-pleasing to the Captain of your salvation, Christ Jesus, to whom be glory for ever and ever. Amen.
Source: Catechetical Lectures (New Advent)