We live in a world that is swirling with deceptive spiritual ideas and damaging doctrines.  In some cases, people can be sidetracked into error for decades-- some even for eternity.  In 1 John chapter four, John gives Christians a powerful warning about fighting spiritual deception.  What positive steps can Christians take to protect themselves from false ideas and destructive beliefs?  What kind of discernment do we need? How do we test things to separate the true from the false?  ~Exposition of 1 John, part 10