Verse 1
1) "Beloved, believe not every spirit " (Greek agapetoi) "beloved ones", an affectionate address to all ages of believers. (pisteuete) trust ye-(me) not. (Greek panti pneumati) (just) any or every spirit. John warns that some spirits should not (must not) be trusted. There are "seducing spirits", 1 Timothy 4:1.
2) "But try the spirits" (Alla) but, strong contrast - (Greek dokimozete) "test ye or prove ye," the spirits. Put the spirits on trial, on examination; Do they speak and cause men to act according to the revealed Word of God? If not they are to be rejected as emissaries, servants, agents of Satan. 1 Timothy 4:1-3; 2 Timothy 4:3-4; 2 Corinthians 11:13-15.
3) "Whether they are of God": Fallen, deranged, demon spirits - enemies of God, work through men - depraved men, to oppose God and Holiness. Note the maniac of Gadara, Mark 5:1-20; Mark 7:24-30, and deceptive miracle workers. Revelation 16:13-14.
4) "Because many false prophets are gone out into the world." 1) Our Lord warned of "false" or lying prophets. Matthew 7:15-23; Matthew 2) Paul did, 2 Corinthians 11:13-15; Acts 20:27-31; Acts 3) Peter did, 2 Peter 2:1-3; 2 Peter 3:1-7. These false prophets have (Greek ekseleluthasin) "Gone out of their own accord -, or will". They were not (Greek stello) sent or authorized of the Lord.