How?
Perhaps D. is the exact opposite of a self-help book at the airport. It’s hard to read and emotionally devastating. You go into the depths of human depravity. Sin is real. Modernity is fraught with contradictions, with danger. Modernity offers mechanical band aids for what are sicknesses of our souls. For Doestoyevsky the greatest man is Christ but he is what we would consider an Idiot.
In the end you are offered catharsis. accept it and you are changed.
I'm off to celebrate Christmas with family but I don't think you can be honest with yourself about who you are unless you appreciate the depths of human depravity, with that understanding you can build a truer foundation for your personal convictions about life.