These four are distortions of perception, thought & view:
• Sensing no change in the changing,
• Sensing pleasure in suffering,
• Assuming "self" where there's no self,
• Sensing the un-lovely as lovely.
Delusion is a mental illness that causes all sorts of suffering; mental
health can be restored by correcting the flaws in how the mind operates.
"Vipallasa Sutta: Distortions of the Mind" (AN 4.49), translated from the Pali by Andrew Olendzki. Access to Insight (Legacy Edition), 2 November 2013, http://www.accesstoinsight.org/tipitaka/an/an04/an04.049.olen.html .
"These are five facts that (the Buddha) said 'ought to be often contemplated upon by everyone - whether man or woman, householder or monk':
• I cannot avoid aging.
• I cannot avoid illness.
• I cannot avoid death.
• I cannot avoid being separated and parted from all that is dear and beloved to me.
• The only thing I control is my actions.
Illness is a natural consequence of being in a body. And yet, in the chronic-illness community (which numbers over 130 million people in the United States alone), it's a commonly held conviction that illness is the fault of the person who is sick. Indeed, the belief that illness is unnatural - literally, going against nature - is shared by many in the population as a whole." Toni Bernhard
Shambhala Sun, November 2013 http://www.shambhalasun.com/index.php