The belief that you are spirit? No that is just a thought. A little closer to the truth than the thought that believes you are who your birth certificate says you are, but still a thought. Spiritual realisation is to see clearly that what you perceive, experience, think, or feel is ultimately not who you are. that ‘I’ cannot find myself in all those things that continuously pass away. The Buddha said ‘No self’ and Jesus said ‘Deny thyself’ do you think that means negate the illusion of self. If the self-ego-were truly who I am, it would be absurd to ‘deny’ it.