What can I say about what I have learned while pondering this...
Science would tell you that the heart is just an organ that serves the body with blood by pumping it throughout. Yes, the heart does this, but it also serves another spiritual purpose being the house of the soul.
The soul is the spiritual representation of ourselves. Though it resides in the same body as our mind, the two are not interchangeable. The mind is connected to the brain, which stores our memory files like a computer. It lists our experiences and recalls learned information like not to pour boiling water down your pants. It stores connections, and by this I mean names, numbers, colors, favorites... blah blah blah.
The soul is connected to the heart, emotions and the arguably present energy fields inside and outside the body. The soul is also linked to memories of a different sort, the way things make us feel. How that favorite song makes us feel. How that woman/man makes us feel. Our parents, siblings, friends, work, the emotional energy connected to those things, that is the soul.
Now because the soul is connected to our feelings, it is connected to our desires, hopes, fears, dreams... and this can pose a problem. This problem being the sin nature that lives within us. Sin is desire... and by that I mean the desire to do things that are against God's intentions. All sins are more or less connected to desire. Why does a person steal? Why does a person cheat? Murder? Name any of the millions of ways that we disrespect each other and God and it typically comes down to desire.
Not, of course, the desire to do evil per say but to serve one's self.
So sever the soul, right? Yeah... So if that were to happen, we would be computers. All we would know is the information that is stored in our memory bank brain. Anything that exists there would become routine and completely irreversible. That includes the good and the bad. And also there would be no sense in either of those words because there wouldn't be a moral compass. The soul is transcribed with all of God's will inside, the problem is we live in a broken world with broken people and some don't want to be fixed.
First step: invite God into your life and specifically into your heart.
God wants to interact with you but being a infinite being, He is hard for the mind and body to comprehend. The soul, however, already has a connection with God that many are unaware of. All you have to do is say, "Hey God..." And just talk. He wants to hear from you and he wants to talk to you.