# An Introduction to Yoga/Lecture I/Chapter 5

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.
Or take the case of the gardener. Out of the wild rose of the hedge has been evolved every rose of the garden. Many-petalled roses are but the result of the scientific culture of the five-petalled rose of the hedgerow, the wild product of nature. A gardener who chooses the pollen from one plant and places it on the carpers of another is simply doing deliberately what is done every day by the bee and the fly. But he chooses his plants, and he chooses those that have the qualities he wants intensified, and from those again he chooses those that show the desired qualities still more clearly, until he has produced a flower so different from the original stock that only by tracing it back can you tell the stock whence it sprang.
So is it in the application of the laws of psychology that we call Yoga. Systematized knowledge of the unfolding of consciousness applied to the individualized Self, that is Yoga. As I have just said, it is by the world that consciousness has been unfolded, and the world is admirably planned by the LOGOS for this unfolding of consciousness; hence the would-be yogi, choosing out his objects and applying his laws, finds in the world exactly the things he wants to make his practice of Yoga real, a vital thing, a quickening process for the knowledge of the Self. There are many laws. You can choose those which you require, you can evade those you do not require, you can utilize those you need, and thus you can bring about the result that nature, without that application of human intelligence, cannot so swiftly effect.
Take it, then, that Yoga is within your reach, with your powers, and that even some of the lower practices of Yoga, some of the simpler applications of the laws of the unfolding of consciousness to yourself, will benefit you in this world as well as in all others. For you are really merely quickening your growth, your unfolding, taking advantage of the powers nature puts within your hands, and deliberately eliminating the conditions which would not help you in your work, but rather hinder your march forward. If you see it in that light, it seems to me that Yoga will be to you a far more real, practical thing, than it is when you merely read some fragments about it taken from Sanskrit books, and often mistranslated into English, and you will begin to feel that to be a yogi is not necessarily a thing for a life far off, an incarnation far removed from the present one.