from the Work of Djwhal Khul & Alice A. Bailey
I have earlier pointed out to you that the basic qualities for which we look are sensitivity, impersonality, psychic capacity and mental polarisation...
... the first requirement is sensitivity. What exactly is this? It does not mean primarily that you are a "sensitive soul" — the connotation of which usually means that you are thin-skinned, self-centred and always on the defensive! Rather do I refer to the capacity whereby you are enabled to expand your consciousness so that you become aware of ever- widening ranges of contact.
I refer to the ability to be alive, alert, keen to recognise relationships, quick to react to need, mentally, emotionally and physically attentive to life and rapidly developing the power to observe upon all three planes in the three worlds simultaneously. I am not interested in your personal relations where they concern your wrong personality sensitivity to depression, to self-pity, your defenses, your so-called sensitivity to slights, to misunderstandings, your dislike of your environing conditions, your hurt pride and qualities of this kind. These all cause you bewilderment and let loose in you the floodgates of compassion for yourself. But you do not need me to deal with them; of them you are well aware and can handle them if you choose. These faults are interesting only in so far as they affect the life of your group; they must be handled by you with care and with the open eye that senses danger from afar and seeks to avoid it. The sensitivity which I want to see developed is alertness to soul contact, impressionability to the "voice of the Teacher," an aliveness to the impact of new ideas and to the delicacy of intuitional responsiveness. These are ever the hallmark of the true disciple. It is spiritual sensitivity which must be cultivated; this is only truly possible when you learn to work through the centers above the diaphragm and to transmute solar plexus activity (which is so dominant in the average person), turning it into heart activity and the service of your fellowmen. [47/8]
The possibility of a definite step forward is yours—a step which will enable you to take up your life's burden, when it is next imposed upon you, in full consciousness of what you are and of what you must do. The period of groping along the path with only the dim light of an illumined aspiration, is slowly giving place to the sure knowledge of an illumined mind. You ask me at times: "What prevents fuller light and understanding?" I reply: "A sensitivity which renders you so constantly self-conscious (by that I mean conscious of the personality) that your very assets as an aspirant seem to you sometimes to stand in your way." 
One of your great limitations is over-sensitivity. Your outer shell needs hardening; you must learn to tune out and to leave unrecognized that which might disturb your life of service. The proverb runs: "They say. What do they say? Let them say." For you this holds much truth. Disciples waste so much time in distress over the words, thoughts and deeds of other disciples and thus time is lost that could be more constructively employed.... Remember... that all suffering along the lines of super-sensitivity indicates self-centeredness, and this in turn militates against the needed inclusiveness which will eventually make this group work successful in service. I point this out, because you have had to wrestle along these lines during the past six months; your major weakness is this sensitivity, which leads to an undue focusing upon the little self. 
This growth in sensitivity is difficult to understand. The members of a Master's group and of His Ashram have to become increasingly sensitive—sensitive to the Master and to His pledged workers. You cannot be made sensitive or be rendered sensitive by some type of process or ordered training. Men and women are sensitive, only they do not know it, being so preoccupied with outer matters, with form life and objective things. Let me put it this way: What you say to yourself and to others—through your spoken words or your life—is so noisy that it is not easy to be what you are and to be recognised as a spiritual being.
The Master is guided by what He knows of you in your quiet moments of aspiration, by what you have demonstrated for years to be your fixed life tendency and by the manner in which you react at moments of crisis or tension. The task of the Master is to stimulate the disciple to be at all times what He knows him to be at his highest times. A Master does this because the need of the world for decentralised, forward-looking, loving and intelligent workers is so great, particularly at this time.
Many have reached the point where they may become sensitive if the loud assertions of personality are dimmed and the light of the soul is permitted to pour through. Then the Master can be known and contacted. When you can get away from yourselves and your personal reactions, your own interpretations, and your personal demands, you will discover for yourselves how and in what manner the Master is seeking to impress you and the group with which you may be affiliated. You will become sensitive to that impression. You can then facilitate (as it is called) the activity of the Master by a profound and deep interest in the esoteric life to the exclusion of your own and also of the Master's individuality. There are many ways which can then be revealed which will aid the interplay between you, the disciple, and the Master. [710/1]
Excerpted from Discipleship in the New Age, Vol 1 on pages noted. http://www.lucistrust.org:8081/obooks/?q=node/133
Also in the compilation "Serving Humanity" p 172-4.
You should realise that... in initiate training, where the objective is wisdom and (above all else) the development of spiritual sensitivity, every phase of approach to the divine unfoldment, and all expansions of consciousness, develop so that divinity is embraced, and every unfoldment of the understanding reveals to the initiate one major Reality—the fact of Being....
From Discipleship in the New Age, Vol. II: http://www.lucistrust.org:8081/obooks/?q=node/142
Leaves Of Morya's Garden Book One The CallInto the New World my first message. You who gave the Ashram, And you who gave two lives, Proclaim. Builders and warriors, strengthen the steps. Reader, if you have not grasped — read again, after a while. The predestined is not accidental, The leaves fall in their time. And winter is but the harbinger of spring. All is revealed; all is attainable. I will cover you with My shield, if you but tend to your labors. I have spoken.--- The Agni Yoga books can be freely downloaded (available in seven languages): http://agniyoga.org/index.html
There is no salvation surer than that through devotion. One can forgive much where there is unswerving devotion. The man who is devoted in heart can be relied upon. It is cause for rejoicing when Hierarchy is upheld by devotion. At present it is especially needed. If yesterday's confusion seemed enormous, what can one say of tomorrow's? I have already prepared you for the growth of Armageddon, and you know that the black wings of darkness will not withstand the Fiery Sword. Be not astonished, the Battle increases!
Agni Yoga: Fiery World I, 605.
Excerpts from some of the books by the Master Djwhal Khul (also known as the Tibetan and the Master DK)
For Newcomers: Extract from a Statement by the Tibetan
Harmlessness (the scientific method, par excellence...of cleaning house & purifying the centres)
Transmission Meditation Groups
It is the creation, in co-operation with the Hierarchy of Masters, of a vortex or pool of higher energy for the benefit of humanity. There are more than 600 Transmission groups in 40 countries worldwide meeting on a regular basis. You may join an existing group in your area, or form your own group by simply inviting a few interested friends to meet with you at least once a week. All you need is the intention to do so and the desire to serve. There is never any fee to participate. http://www.transmissionmeditation.org
An excellent online catalogue and library documents the stages of return to the modern world of Maitreya & the Masters of Wisdom. An ongoing process for which some have been preparing humanity since 1875.
Collection of articles by Aart Jurriaanse
He wrote some compilations from Alice A. Bailey's books along with commentaries on those teachings. His work has helped many students of the Ancient Wisdom Teachings.
Agni Yoga Teachings (all the books in seven languages can be downloaded at www.agniyoga.org)
Agni Yoga Teachings regarding sex
If we compare two individuals, of whom one dissipates the vital substance while the other consciously conserves it, we will be amazed at how much more sensitive the spiritual apparatus of the second becomes. The quality of his labors becomes entirely different, and the quantity of his projects and ideas multiplies. The centers of the solar plexus and brain are being heated, as it were, by an invisible fire.
This article was dictated by the Tibetan teacher, Djwhal Khul, in 1934. It is printed in the book, The Externalisation of the Hierarchy, pp. 3-20, published by the Lucis Publishing Company. The need for trained esotericists is more urgent today than it was then.
The Alice Bailey books were published by Lucis Trust and can be purchased directly from them, or from fine bookstores everywhere: http://www.lucistrust.org
Lucis Trust has a ~new 14-page introductory PDF booklet about the 3 major full festivals