3
The way we can be sure we know him is if we are obeying his commands.
4
Anyone who says, "I know him," but isn't obeying his commands is a liar - the truth is not in him.
5
But if someone keeps doing what he says, then truly love for God has been brought to its goal in him. This is how we are sure that we are united with him.
6
A person who claims to be continuing in union with him ought to conduct his life the way he did.