An Autobiographical reflection by Theosophist C.W Leadbeater.

Some passages from the book:

“It was in Madame Blavatsky’s room in that hotel that I first saw one of the members of the Brotherhood. While sitting on the floor at her feet, sorting out some papers for her, I was startled to see standing between us a man who had certainly not entered by the door, which was straight before me the whole time, and had not opened. I jumped up uttering a sharp exclamation of surprise, which caused Madame to laugh inordinately. She said banteringly:
‘You will not go far on the path of occultism if you are so easily startled at a little thing like that.’
Then she presented me to the visitor, who proved to be he who is now the Master Djwal Kul, although he had not then taken the Initiation which made him an Adept.” (Chapter VI)

“It must not for a moment be supposed that the attainment of this particular power was the end of the occult training. On the contrary, it proved to be only the beginning of a year of the hardest work that I have ever known. It will be understood that I lived there in the octagonal room by the river-side alone for many long hours every day, and practically secure from any interruption except at the meal-times which I have mentioned. Several Masters were so gracious as to visit me during that period and to offer me various hints; but it was the Master Djwal Kul who gave most of the necessary instruction. It may be that He was moved to this act of kindness because of my close association with Him in my last life, when I studied under Him in the Pythagorean school which He established in Athens, and even had the honour of managing it after His death. I know not how to thank Him for the enormous amount of care and trouble which He took in my psychic education; patiently and over and over again He would make a vivid thought-form, and say to me: ‘What do you see?’ And when I described it to the best of my ability, would come again and again the comment: ‘No, no, you are not seeing true; you are not seeing all; dig deeper into yourself, use your mental vision as well as your astral; press just a little further, a little higher.’

This process often had to be many times repeated before my mentor was satisfied. The pupil has to be tested in all sorts of ways and under all conceivable conditions; indeed, towards the end of the tuition sportive nature-spirits are specially called in and ordered in every way possible to endeavour to confuse or mislead the seer. Unquestionably it is hard work, and the strain which it imposes is, I suppose, about as great as a human being can safely endure; but the result achieved is assuredly far more than worth while, for it leads directly up to the union of the lower and the higher self and produces an utter certainty of knowledge based upon experience which no future happenings can ever shake.” (Chapter IX)