Man wants truth, wants to experience truth for himself, to grasp it, to realize it, to feel it within his heart of hearts; then alone, declare the Vedas, will all doubts vanish, all darkness be scattered, and all crookedness be made straight.
The science of Raja Yoga proposes to put before humanity a practical and scientifically worked out method of reaching this truth.
In acquiring knowledge we make use of generalization, and generalization is based upon observation. We first observe facts, and then we generalize, and then we draw our conclusions or principles. The knowledge of the mind, of the internal nature of man, of though, can never be had until we have the power of first observing the facts that are going on within.
The science of Raya Yoga, proposes to give men such a means of observing the internal states, and the instrument is the mind itself. The power of attention of mind, when properly guided, and directed towards the internal world, will analyze the mind, and illumine facts for us.
What is the use of such knowledge? In the first place, knowledge itself is the highest reward of knowledge, and, in the second place, there is also utility in it. It will take away our misery. When, by analyzing his own mind, man comes face to face, as it were, with something which is never destroyed, something which is, by its own nature, eternally pure and perfect, he will no more be miserable, no more unhappy. All misery comes from fear, from unsatisfied desire. Man will find that he never dies, and then he will have no more fear of death. When he knows that he is perfect, he will have no more vain desires, and both these causes being absent, there will be no more misery there will be perfect bliss, even while in this body.