“No man knows had bad he is till he has tried very hard to be good. A silly idea is current that good people do not know what temptation means. This is an obvious lie. Only those who try to resist temptation know how strong it is.”
Bad people don’t know wickedness because they live a sheltered life. Sheltered from the resistance of evil. If we resist evil, evil fights back. If we don’t resist evil, evil leaves us alone.
Lying down in a windstorm doesn’t give one an appreciation for the strength of the wind. Only standing up against the wind can one appreciate the power of the wind.
“We never find out the strength of the evil impulse until we try to fight against it.” (Mere Christianity, p. 124-5)