Tradition
St. Cyril of Jerusalem
Catechetical Lectures
Book 21 › Introduction
(On the Mysteries. III.)
On Chrism.
1 John 2:20-28
But you have an unction from the Holy One, etc.....that, when He shall appear, we may have confidence, and not be ashamed before Him at His coming.
Source: Catechetical Lectures (New Advent)