The following points have to be learned if one hopes to fill the office of a spiritual teacher:
(a) Weaknesses of moral character must be mercilessly sought out and uprooted. No task should be undertaken which might induce their return.
(b) Whatever form of service is given must be accompanied by spotlessly pure motives--never out of desire for reward or expectancy of return.
(c) When the work of teaching involves one in no personal expenses he cannot meet out of his ordinary professional earnings, he should not accept emolument. This is considered bad karma.
(d) When the work of teaching brings one in contact with the opposite sex, he must not take advantage of his influence to have any but the purest, spiritual relationships. To break this rule is again to invite bad karma.
(e) One should not meditate haphazardly with anyone and everyone who comes to him.
These are serious dangers to which the would-be teacher must be extremely attentive. It is partly to help counteract these dangers that I have explained the philosophic discipline and emphasized the need of cultivating reason in my last seven books.
-- Notebooks Category 25: World-Mind in Individual Mind > Chapter 6 : Teaching Masters, Discipleship > # 54
