"It was through these works that I myself first came to know their author, and afterwards Madame Blavatsky herself; from both of them I learned much. When I asked Madame Blavatsky how one could learn still more, how one could make definite progress along the Path which she pointed out to us, she told me of the possibility that other students might be accepted as apprentices by the great Masters, even as she herself had been accepted, and that the only way to gain such acceptance was to show oneself worthy of it by earnest and altruistic work. She told me that to reach that goal a man must be absolutely one-pointed in his determination; that no one who tried to serve both God and Mammon could ever hope to succeed. One of these Masters Himself had said: "In order to succeed, a pupil must leave his own world and come into ours." Ch. II"
January 1, 1970
https://en.wikiquote.org/wiki/Masters_of_Wisdom_(Theosophy)