Guru says on the strength of śāstra. Therefore sādhu-guru-śāstra, three things must be there. Guru must be speaking on the strength of Vedic knowledge, not manufacturing. He's a rascal. Guru cannot become by manufacturing nonsense ideas. He's not guru, he's a rascal. Whatever guru will speak must be evidenced by the śāstra. That is guru. So you go to guru.
So guru will say that, "Yes, you're right. The soul was there." How it is right? "No, in śāstra." "What is that śāstra?" "In Bhagavad-gītā it is said, dehino 'smin yathā dehe kaumāraṁ yauvanaṁ jarā (BG 2.13). Asmin dehe, this body, there is the proprietor of this body. That is soul." I love this body because I live in this body. I do not love your body or another's body, but I love my body. Why? Because I live in this body. This is proprietorship. I take care of my apartment because I live in that apartment. I'm not going to take care of your apartment. (laughter) These are common sense. And śāstra confirms it, asmin dehe. Dehī. Dehī means the proprietor. So in this way you can understand what is the soul. This is realization of the existence of soul. Is it very difficult?