This is another great theme of the Vedanta, this Oneness of life, this Oneness of everything. We shall see how it demonstrates that all our misery comes through ignorance, and this ignorance is the idea of manifoldness, this separation between man and man, between nation and nation, between earth and moon, between moon and sun. Out of this idea of separation between atom and atom comes all misery. But the Vedanta says this separation does not exist, it is not real. It is merely apparent, on the surface. In the heart of things there is Unity still. If you go below the surface, you find that Unity between man and man, between races and races, high and low, rich and poor, gods and men, and men and animals. If you go deep enough, all will be seen as only variations of the One, and he who has attained to this conception of Oneness has no more delusion. What can delude him? He knows the reality of everything, the secret of everything. Where is there any more misery for him? What does he desire? He has traced the reality of everything to the Lord, the Centre, the Unity of everything, and that is Eternal Existence, Eternal Knowledge, Eternal Bliss. Neither death nor disease, nor sorrow, nor misery, nor discontent is there. All is Perfect Union and Perfect Bliss. For whom should he mourn then?