Jesus performed various types of sadhanas and ultimately realised this truth. Once Mary and Joseph took their child Jesus to a fair in Jerusalem. In the crowd, the parents lost trace of Jesus and searched for him everywhere. All the while, Jesus was sitting in a corner of the temple and listening to the sermon of the priest. The parents were searching for him outside the temple. Mother Mary ultimately found him in the temple. She rushed towards him and affectionately embraced him saying, "My son, what happened to you? Where had you gone? We have been in search of you." Jesus told her, "Mother, I have not stepped out of the temple. I have been listening to the sermon of the priest. Why should you have any fear? Those who believe in the world will have fears. But, why should anyone believing in God, fear at all? I am in the company of my Father, why do you fear?"
Forgetting your innate divinity, you are in search of God in the external world. You are God yourself. Is it not foolishness to search for yourself in the outside world? Look within, only then can you find God. It is very easy to understand this oneness. However, you should have firm faith to begin with. You should believe that God is not separate from you. On a deep enquiry, you will realise that God is in you and also outside.
(Extract from the Divine Discourse delivered by Bhagawan Sri Sathya Sai Baba on 25th December 2003 at Sai Kulwanth Hall)