How does Les define a perversion of the truth?

Les explains that a perversion should not be thought of as something way down in the gutter. Rather, perversion is anything that has twisted the truth far enough that it is off-center and will mislead people. He notes that since the turn of the century, Christianity has been bombarded with perversions. In Galatians, Paul recognized the Galatian churches were being perverted by someone telling them they had to also keep the Mosaic Law. Paul then says that if anyone, even an angel from heaven, preaches any other gospel than what he preached, let him be accursed. Les shudders to think of the end of someone who takes this gospel and perverts it.