Lord Shiva

Advice from H.H.Shri Mataji Nirmala Devi:

1977-0222 About different Chakras and their Deities by Sahaja Library

God Shiva is existence. And this is the first form which emerges into all these forms. Like the seed emerges into the whole tree and becomes the seed, and ultimately at the dissolution point also it becomes Shiva. That is why it is known as Shiva, means the permanent form. It doesn’t go into any formations. It doesn’t incarnate. It is a witness which watches. That’s the aspect of God. So you have got three aspects of God. The first one which is the Shiva, which is the existence, the second one which is the creator, which is Brahmadeva and the third one which is Vishnu, which is the sustenance, which evolves, which gives evolutionary movement, which incarnates, which has incarnated ten times.
(extract from Talk on Chakras and Deities, Delhi, 1977-0222)

1979-0611 How Aspects of God are expressed within us by Sahaja Library

So I would like to give you a little idea about this picture that we have in front of us. Now whom we call as God Almighty, the One who is eternal, who doesn’t incarnate, who is all the time there watching the play of His power, the Primordial Mother, is manifested through Her Power into His three aspects here, clearly, within ourselves and within the Primordial Being who is the ultimate which all the created people have to reach. Now theres a difference between the two, the Almighty - God, as you call Him, the One who never incarnates, and the One who incarnates on this earth and occupies a position like this, just like a human being, and He's called as a Primordial Being or you can say the Virata. You can call Him the Virat. Actually, though He's called as Primordial Being, He's an aspect of God. So these are two things if you understand, I will be able to explain to you how the aspects of God are expressed in us.
So the first aspect of God is His desire to create, His desire to create and in His desire to create. ... So His desire to manifest, His desire to create, that's the aspect within us which is represented by this blue-colored line which is called as the Adi Ida Nadi, or you can call it the primordial Ida channel by which He desires. Now as the desire can be born and can be finished off, can be switched off, in the same way, His desire to create also can be over. His desire to create any more may be over. His desire not to create for the time being could be there. So if you understand your desires, you can understand His desire also to create and thats why when He does not desire to have it anymore, the creation He can destroy.
So He is the One through which we exist and through which we are destroyed, too. So He’s the One who manifests existence and destruction of creation. That’s why He is called as Destroyer. This aspect is represented by the principle of Shiva, which never incarnates because this principle is the one which is the germ, which is the beginning and which the end of everything. Like a seed becomes the seed ultimately, in the same way this Shiva tattwa, this principle of Shiva, germinates, creates and then it again becomes the same principle. That’s why the principle of Shiva never changes. It is called as Shiva, means it is permanent, it is eternal.
(extracts from Talk 'How Aspects of God are experienced within us', Caxton Hall, London, 1979-0611)