"Indeed, how can the Masters, who are on watch over the world and who lead the greatest Cosmic Battles, overburden themselves by accepting a great number of disciples? Considering the present state of consciousness of humanity, this would be an unproductive expenditure of the most precious energy, which is so essential for maintaining the equilibrium of our planet. There are many who read the books of the Teaching of the White Brotherhood and who mentally follow the indicated path, and because of this they consider themselves as disciples of this or that Great Teacher chosen by them. They are partly right, for if they continue to strive, and mainly if they try to apply the Teaching in life, they will enter the path of true discipleship, sooner or later, in this or another life. But ask yourself sincerely and seriously—have you met many such disciples, who even partially apply in life the foundations of the Living Ethics learned by them from the books of the Teaching? And without a complete application of the Teaching, or rather, without self-denial in carrying out life's achievement, is it possible to hope for a closer approach?"
January 1, 1970
https://en.wikiquote.org/wiki/Masters_of_Wisdom_(Theosophy)