If he gives a promise he must keep it—no matter how hard it may be for him. He must constantly be wary of any unconscious lying, dishonesty, or inaccuracy, either to himself or to others. He should watch over his thoughts, his speech, and his way of being with people.
He must try to be as honorable and as sincere as he can, both with himself and with all those with whom he has dealings. He has to learn to have compassion for everyone with whom he comes into contact, because he never knows what profound hidden pain and worry this person may be carrying in him. He must become aware of the fact that, in one way or another, all beings suffer.
If, right from the start, moral values do not develop along with his inner spiritual work, then the seeker can be absolutely sure that his struggles will not bring him the true spiritual comprehension and unfolding he is seeking. His misdirected efforts may even accentuate and crystallize his undesirable tendencies, making them yet more difficult to eradicate later.
Fidelity to oneself also means fidelity to others; what one would wish for oneself, one must wish for others too. If a person does not want to be robbed of his happiness, he must not rob others of theirs either. The seeker must begin this spiritual work with the clear understanding that there is nothing in the universe that is not part of the whole. And if each thing is part of the whole, then there is only the One. All beings and everything in the world, as well as all the planets and stars, are parts of the Divine Universal Being in the same way as one’s head, neck, arms, trunk, legs, internal organs, and blood cells are part of the whole of oneself. Whatever harm is done to the one, the whole will inevitably suffer, sooner or later.
That is why there is so much insistence throughout a greater part of the text that follows on moral values and sincerity of being.
The Law of attention (chp Introduction)