Self realisation is when you throw a stone in a pond, to later see your reflection after the ripple effect. In addition, it is also like looking into a mirror and seeing your Aradhya within you. We have different potentials, because we're all one with Prabhu. Our purposes are to do our dharma and also protect it. Learn our Shaastr and spread it. Speak with confidence and mean it. Other than this, we are all stuck in the wheel of Karma searching for Moksh. We all wish to overcome Maya.

And how to do so?! Naamjap and mantras. Mantras are the venerated dew from the lotus feet of the divine. That dew have been collected by the ancient enlighemed sages like how raindrops were collected by banana leaves.
Self realisation is just recognising the love of God. Nothing extravagant! It is such a point where one gets divine happiness. This divine joy! Within that point, one will see their Aradhya in everything and anything.

But is it delusion or obsession?! No! We know it's real, when we know our faith is real. Shraddha doesn't manifest in the brain, but the heart. Shraddha and such are like a type of fire. Remember our bodies are like trees. Whenever we apply fire on top of a tree, it will easily catch afire. Think of it, a burning tree starts burning on top and not at its trunk. Shraddha is ever sacred, yet some use it wrongly to look down at others, hence the fire of ego is set in the brain. Yet if we keep Shraddha in our hearts, no ego can ignite.
Yes, this will spread to the brain, but at the end of the day it is fueled by the heart.