John 8 - The truth will set you free

In the great controversy, what is Truth opposing? 

The lesson this week states it is a battle between "truth and error", but quotes from John 8 where Satan is called the "father of lies". It doesn't seem that error means exactly the same thing as lies, and so we explore this passage in John to see what might be the opposite of Truth. We strongly suspect the issue at hand might go deeper than erroneous intellectual ideas.