There is yet another reason why esoteric teaching is desirable with respect to a certain class of truths. It is eminently the fact in regard to this class that "knowledge is power." The public promulgation of a philosophy profoundly intellectual, sufficient to train an already highly developed intellect, and to draw the allegiance of a lofty mind, cannot injure any. It can be preached without hesitation, for it does not attract the ignorant, who turn away from it as dry, stiff, and uninteresting. But there are teachings which deal with the constitution of nature, explain recondite laws, and throw light on hidden processes, the knowledge of which gives control over natural energies, and enables its possessor to direct these energies to certain ends, as a chemist deals with the production of chemical compounds. Such knowledge may be very useful to highly developed men, and may much increase their power of serving the race. But if this knowledge were published to the world, it might and would be misused, just as the knowledge of subtle poisons was misused in the Middle Ages by the Borgias and by others. It would pass into the hands of people of strong intellect, but of unregulated desires, men moved by separative instincts, seeking the gain of their separate selves and careless of the common good. They would be attracted by the idea of gaining powers which would raise them above the general level, and place ordinary humanity at their mercy, and would rush to acquire the knowledge which exalts its possessors to a superhuman rank. They would, by its possession, become yet more selfish and confirmed in their separateness, their pride would be nourished and their sense of aloofness intensified, and thus they would inevitably be driven along the road which leads to diabolism, the Left Hand Path, whose goal is isolation and not union. And they would not only themselves suffer in their inner nature, but they would also become a menace to Society, already suffering sufficiently at the hands of men whose intellect is more evolved than their conscience. Hence arises the necessity of withholding certain teachings from those who, morally, are as yet unfitted to receive them; and this necessity presses on every Teacher who is able to impart such knowledge. He desires to give it to those who will use the powers it confers for the general good, for quickening human evolution; but he equally desires to be no party to giving it to those who would use it for their own aggrandisement at the cost of others.