Yoga may then be defined as the “rational application of the laws of the unfolding of consciousness in an individual case”. That is what is meant by the methods of Yoga. You study the laws’ of the unfolding of consciousness in the universe, you then apply them to a special case—and that case is your own. You cannot apply them to another. They must be self-applied. That is the definite principle to grasp. So we must add one more word to our definition: “Yoga is the rational application of the laws of the unfolding of consciousness, self-applied in an individual case.” Yoga Is a Science Next, Yoga is a science. That is the second thing to grasp. Yoga is a science, and not a vague, dreamy drifting or imagining. It is an applied science, a systematized collection of laws applied to bring about a definite end. It takes up the laws of psychology, applicable to the unfolding of the whole consciousness of man on every plane, in every world, and applies those rationally in a particular case. This rational application of the laws of unfolding consciousness acts exactly on the same principles that you see applied around you every day in other departments of science. You know, by looking at the world around you, how enormously the intelligence of man, co-operating with nature, may quicken “natural” processes, and the working of intelligence is as “natural” as anything else. We make this distinction, and practically it is a real one, between “rational” and “natural” growth, because human intelligence can guide the working of natural laws; and when we come to deal with Yoga, we are in the same department of applied science as, let us say, is the scientific farmer or gardener, when he applies the natural laws of selection to breeding. The farmer or gardener cannot transcend the laws of nature, nor can he work against them. He has no other laws of nature to work with save universal laws by which nature is evolving forms around us, and yet he does in a few years what nature takes, perhaps, hundreds of thousands of years to do. And how? By applying human intelligence to choose the laws that serve him and to neutralize the laws that hinder. He brings the divine intelligence in man to utilise the divine powers in nature that are working for general rather than for particular ends. Take the breeder of pigeons. Out of the blue rock pigeon he develops the pouter or the fan-tail; he chooses out, generation after generation, the forms that show most strongly the peculiarity that he wishes to develop. He mates such birds together, takes every favouring circumstance into consideration and selects again and again, and so on and on, till the peculiarity that he wants to establish has become a well-marked feature. Remove his controlling intelligence, leave the birds to themselves, and they revert to the ancestral type.