"He is all the time being tuned up, and thus growing gradually more and more like his Master, however remote the resemblance may have been in the beginning; and thus he becomes of great service in the world as an open channel by means of which the Master’s force may be distributed on the lower planes."
January 1, 1970
https://en.wikiquote.org/wiki/Masters_of_Wisdom_(Theosophy)