Why does the devil lie? Why do the servants and slaves of darkness lie?
To manipulate our will.
To make us want that which is evil: hate that which is good.
Make the beautiful be known as ugly; and the vile desirable.
And to render Truth too simple, obvious, crude, cruel.
It is to affect our values that the devil lies.
Ultimately, it is so each shall will his own damnation; that the demonic forces lies.