Originally Posted by mrstace 1 John 4:1 Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
Whenever we come across a passage that is difficult to understand, it always helps to look at the context -- the verses immediately before and after our passage.
In this case, the very next verse explains how we are to try/test the spirits. We are to do it by comparing what they say concerning Jesus with what the Bible says concerning Jesus.
This gives us a good clue as to tell the cults from real Christianity. The cults always want to make Jesus into someone less than He is presented in the Bible.