To know is to obey

1 John 2:1-11
Says,"I know him," but does not do what he commands is a liar, and the truth is not in him. But if anyone obeys his word, God's love is truly made complete in him.
This old command is the message you have heard.
Yet I am writing your a new command; its truth is seen in him and you, because the darkness is passing and the true light is already shining.
Claims to be in the light but hates his brother is still in the darkness. Whoever loves his brother lives in the light, and there is nothing in him to make him stumble.
People walks around in the darkness, because the darkness has blinded him.
What is more, we have Jesus - the one through whom we are forgiven - to plead our cause.
How can we be sure that we really know God? To know is to obey. So the first test is obedience. If we obey God's commands, if we live as Jesus did, we can be sure.
The second test is love. living in Gods light means keeping the old-and-new command to love one another (the 'new commandment' Jesus gave his disciples- John 13:34 - which John knows these Christians have already been taught).
Why?
Really knowing Jesus is obedience to his command. This is the qualify of believing in Jesus.
Second command is love: old command is love God and love others as love us. New command is love our brothers.
Let the real light shine on others around me, love others and love my brothers, care their needs.
How?
Show love of Jesus from me to others, love others as Jesus loves me. Obedience and Love is the two characters of a real Christian.