When the Kundalini passes through the five centres, it enters into the area which we call as Limbic area. This area is all surrounded by thousand nerves and when these nerves get enlightened, they look like flames of VIBGYOR colours, seven colours. And very mildly, beautifully shining, emitting peace.
But when the Kundalini starts emitting its vibration on the sides, all these nerves get enlightened gradually and start moving on all directions, opening the Sahastrara and then the Kundalini emerges out, through the fontanelle bone area, which we call as 'Brahmarandhra.’ ‘Randhra’ means the ‘hole’ and the ‘Brahma’ is the all-pervading power of God’s love.
So, it enters into the subtle energy, which is all-pervading, which we do not feel normally. But then the chaitanya, the vibrations, which are the part and parcel of this energy, all-pervading power, the Paramachaitanya, they start entering into our brain. And showering their blessings, in the Limbic area they assemble.
Now the Limbic area is connected to all the area of the brain and also to the nerves. So, it starts flowing onto the nerves, giving you the new awareness of Collective Consciousness, called as ‘Samuhik Chetana.’ So, you get a new chetana, a new awareness, which is showered upon your Limbic area.
The working of these chaitanya waves is very interesting. They are normally formed like small commas but then they go into different forms. They make themselves into Swastikas, as the four-limbed symbol of innocence, or they become the Omkara. As you know how ‘Om’ is written, which is the symbol of our doing, our awareness. So, when they form the Swastika, they try to nourish the left side and when they form the Omkara, they nourish the right side - left and right sympathetic nervous systems they nourish.
But Sahastrara is to be kept open, is rather difficult for people because it’s a vicious circle. First, these vibrations should enter into your brain through the Brahmarandhra, when it is opened out. And they should nourish your nerves, by which your left and right side open out and so more chaitanya can flow down all these centres. But if your Sahastrara is not properly opened, this process doesn’t take place. As a result of that the chakras don’t open, the Kundalini only as very few strands is kept in the spinal cord and the new strands cannot rise because your chakras are not open. So, in Sahaja Yoga, it is very important to keep your Sahastrara open.