To believe that you have a soul is to believe in God. Where do you think your soul came from? Where do you get the idea that we have a God inside of us? If you don't believe the Bible, where are you getting your source of having a soul from? Love from? Not only does the Bible explicitly say not to trust ourselves or lean on our own understanding, but given our human nature as being naturally vulgar and hateful human beings, why on earth would you trust yourself? We are born selfish.