"I do not know if you have long known them personally, but my niece spoke to me about them, and that very fully, years ago. She wrote to me that she had seen and reknitted her connection with several of them before she wrote her Isis. Why should she have invented these personages? With what object ? and what good could they do her if they did not exist? Your enemies are neither wicked nor dishonest, I think; they are, if they accuse you of that, only idiotic. If I, who am, I hope, to remain to my death a fervent Christian, believe in the existence of these men — though not in all the miracles alleged about them — why should not others believe? I can certify to the existence of one of them, at least. Who could have written to reassure me in the moment when I most needed such reassurance, if it were not one of these Adepts they talk of? It is true that I do not know the writing, but the way in which it was delivered to me was so phenomenal that no one, save an adept in occult science, could have accomplished it. It promised me the return of my niece, and the promise was fulfilled. Anyhow, I will send it to you in a fortnight, and you will receive it in London."
January 1, 1970
https://en.wikiquote.org/wiki/Masters_of_Wisdom_(Theosophy)