A Chela is one who has offered himself or herself as a pupil to learn the "the hidden mysteries of the Universe and the psychic powers in man." The spiritual teacher is called in India, a Guru. A true Guru is a master of the esoteric who to varying degrees has developed in himself both the power and the will to deal with true metaphysics. One of first qualifications to be a chela is: "Perfect physical health." It does not mean we are required to have body of an athlete or an acrobat, but it should be strong enough to take the stress which is involved in tearing away the lower from the Higher Self. Next, we need to develop our mental and moral abilities and the power of will.  A true chela does not run to  

the nearest temple and make offerings, or resort to ceremonies and rituals to be relieved of the life's pain, but he accepts whatever troubles and trials come our way, and thereby strengthens himself spiritually.

Moral strength is the capacity to follow the dictates of Spirit even though it may run contrary to the so-called morality of the world.

In a sense, a school teacher, who has taught us our alphabet, is our guru. A child does well, if he holds this teacher in reverence and tries to follow what he teaches, faithfully. This attitude of reverence is very important. In the East, a Guru is regarded as with the respect reserved for one's parents.. The relationship between Guru and chela is deep. In the eyes of the chela, the Guru represents the Higher Realms.. In the East, to be disrespectful to one's Guru, even in thought, is considered to be a great moral lapse by the pupil. 

The proper function of the Guru is to readjust the chela with his presence or  with his knowledge expressed in clear and easily comprehended terms. The love which exists between them acts as a stimulus and purifier for the mind of the chela.

A Guru tests his chela in various ways. The test consists in seeing how well he responds to it. The attitude with which he responds decides everything. A story is told that a disciple, when he saw men merry-making and drinking, felt disgusted and also proud that he was not indulging in such things. The Guru of this disciple made him work through the brain of a drunken person, i.e., the disciple had to work through the physiology of another person with the drunkenness problem