There are many details, but I am only mentioning the most important points. When, through proper training and daily practice, one is able to learn how to gather up the wandering mind, and withdraw these different powers of the mind from different sources and focus them on one thing, then so much energy has been combined, as it were, and we can accomplish something. Otherwise, so much of our energy has been dissipated. Regarding the difficulties and dangers of concentration, let me mention that there are difficulties in all paths, in all fields of knowledge. Nothing worth achieving has been accomplished without a little difficulty, without a little sacrifice, without a little sincere and earnest effort. You know, curiosity-seekers never reach anything in life. Those who are sincere and earnest searchers and seekers have gradually unfolded themselves and reached the higher realms of understanding. So there is no real danger in concentration. We must start with that idea, and not be hasty. Many of us try to take things like a pill. We take a pill, and it must accomplish its results. Concentration is not a pill--and we do not know what accumulated experiences and impressions are at our backs. Through different lives and through the present life we have been gathering up so many things. We are performing so many karmas, as we say, and we have to eliminate so many things in our lives. Through proper effort we shall remove many obstacles, many difficulties, and our task will become easier and easier. Now, the Yogis, in figurative language call this opening up of the inner consciousness the awakening of the Kundalini. You will see--if you analyse your life--that there are a few things which are constantly holding your attention. The mind, as it were, is drawn into certain realms. As I explained in the beginning, sense perceptions are in different forms and include many things--our eating, our drinking, all sorts of habits and many other things. Thus the best of our energies are swallowed up, as it were, by these things. The Yogis claim that the nerve centers--the lower nerve centers--have absorbed these energies and the energies are chained there, or enslaved there, and you have to release them. There are two sides, the physiological and mental. Physiologically, when we begin to practise concentration, this energy is gradually released from the lower centers. It is called the awakening of Kundalini--coiled-up energy--energy in latent form or enslaved form. Simultaneously our mind is released from its impressions and begins to work in a higher realm. Time will not permit me to enter into the details of this subject, but I just want to touch upon some important points, so that you will think and study and investigate more.