According to the Raja-Yogi, the external world is but the gross form of the internal, or subtle. The finer is always the cause, the grosser the effect. So the external world is the effect, the internal the cause. In the same way external forces are simply the grosser parts, of which the internal forces are the finer. The man who has discovered and learned how to manipulate the internal forces will get the whole of nature under his control.
The Yogi proposes to himself no less a task than to master the whole universe, to control the whole of nature. He wants to arrive at the point where what we call "nature's laws" will have no influence over him, where he will be able to get beyond them all. He will be master of the whole of nature, internal and external.
The progress and civilisation of the human race simply mean controlling this nature........The end and aim of all science is to find the unity, the One out of which the manifold is being manufactured, that One existing as many.Raja-Yoga proposes to start from the internal world, to study internal nature, and through that, control the whole — both internal and external. It is a very old attempt. India has been its special stronghold, but it was also attempted by other nations.(I, 132-33)