**Mental illness is scientifically documented… It’s not someone’s fault they’re depressed, bipolar, or Schizophrenic… Geesh I would hope the good Catholics here don’t actually believe that mental illness makes one evil… **
Mentally ill people can be the source of great evil in this world. Mass murders, serial murders, cannibalism, etc. Pathological lying can also be the cause of evil. I hope you never have to have a close relationship with a pathological liar. They know they are lying, but they lack the will to stop lying. They have freely given themselves over to lying as a life style.
In the cases where the person’s brain chemistry is malfunctioning, or drugged, the person can be the cause of evil while not realizing it. Charles Manson, for example.
In the case of neurotic behavior, which is curable with treatment and counseling, Dr. Peck had documented in his own practice frequent resistance on the part of people to face the truth about themselves and their disturbed behavior. They will even lie to get out of being treated, claiming they are fully cured and no longer need treatment. When he would point out that they were far from healed, they would go into denial, following their own wish rather than the physician’s desire to continue treatment.
I saw a young teenager once self destruct by persuading himself that he needed no further chemo for his cancer and refusing further treatment. He died within 3 months.
I’ve often thought we tell more lies to ourselves than others can possibly tell us. In my own case, I’ve stopped standing on the weight scales every morning. Then I go have some pancakes and syrup!
There is a fine line between lying and delusion. But in both cases, the truth is not present.