1 John 4 5 They are of the world: therefore speak they of the world, and the world heareth them.
6 We are of God: he that knoweth God heareth us; he that is not of God heareth not us. Hereby know we the spirit of truth, and the spirit of error.
In these verse we see first that those that are of the world. They only believe what they see and hear because they are caught up in the world. They have no hope because they have eyes to see and do not see and ears to hear and do not hear. They place their faith in this world and its trappings.Next we see that we have ears to hear and hear what the word of God is saying and those know God hear us to and those that do not God does not hear us. This is also saying that we believers can discern the difference in the spirit of truth and the spirit of error, in other words tell the difference in true believers and non believers. Lets us strive to know the standards set by the word God so we can do His will.