Spirituality is very necessary to keep oneself alive. Having understood what is what, you come to the conclusion that death is also an illusion. A jnani is one who abides in the Absolute, who is the Absolute only. Only a jnani knows that everything is not, everything will not be, and everything has never been. For a jnani, individuality has been liquidated completely; there is only manifest consciousness, which is ample and plenty for him.