"A necessary condition to be a master is to be full of purity. We often ask ourselves: "Why worry about the master's character and personality? We must judge only what he said and revealed to us ". This is false; if a human being wishes to instruct me on problems related to mechanics or chemistry etc., then he can be whatever he wants, morally speaking, because the physical sciences involve first of all intellectual qualities. However, from the beginning to the end of progress in the spiritual sciences, it is impossible for any kind of spiritual light to appear in an impure soul. The sine qua non condition to know God is the purity of the heart. A vision of God or the perception of what lies beyond appearances is never obtained before the purification of the soul. “Blessed are the pure in heart, for they shall see God” In this one sentence the essential teaching of all religions is condensed. If you have understood this, you know all that has been said in the past and all that will be said in the future, you no longer need to search elsewhere because you have all that is necessary in this single sentence; such phrase succeeds in doing what all the writings put together cannot do. So, as far as the spiritual master is concerned, we should first see if he is what he claims to be. He must be perfectly pure. Only then his words are valid because he is the true "transmitter", the true "divine antenna" through which God can reveal himself in an undistorted manner. What could it convey to us if it did not hold the spiritual power and purity itself? In order for him to transmit to the disciple, through resonance, the vibration of spirituality, this vibration must be firmly stabilized in his consciousness. In reality, the teacher's role is to convey something and not just to stimulate the intellectual faculties or any other type of his student. Something real and profound is transmitted from the master to the disciple: Shakti. For this reason, the teacher must be pure, since the transmission is realized only outside of any selfish motive: profit, glory, fame, etc. The Holy Spirit can only be transmitted through love. Any selfish motive drives away love. God is love; only he who knows God as love can teach men what holiness, faith and God are. When you find all these things gathered in your master, you are safe; otherwise, if you do not find them, it is not prudent to follow his teaching, since he will not be able to pour holiness into your hearts, and run the great risk that you only pour into yourself perversion. We cannot learn to love, to understand and to assimilate the truths of the spiritual path in any place and from anyone ".