How do I know it is? faith, that is all I can say.
"blessed is he who believes without seeing"
I have faith that the bible is true, and the word of God. And I belief everything that is said in it.
I have faith in my God and have faith that the Holy Spirit is within me.
Tis all faith in the end.
Scientists could come with an explanation of: It's chemical enduced by extreme fantasising processes of the brain which makes the person belief that there is something more.
But yet I will keep my faith, beacouse I have faith in God and that he is real. Even if they throw explanation this and that at me, I will not loose my faith.
Michael