How we know we are in him - obey his commands

1 John 2:1-6
My dear children, I write this to you so that you will not sin. But if anybody does sin, we have one who speaks to the Father in our defense- Jesus Christ. Here is occasional does sin.
We know that we have come to know him if we obey his commands.
This is how we know we are in him - must walk as Jesus did.
Why?
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.
Forgiveness is a mercy of God, the Lord asked us repent and confess our sins. Turn our heart to Him and obey his commands to sure we are in Him.
When we are in Him, we will not sin.
How?
Read his words for our selves and have good relationship with Him everyday. Keep his words in our heart and obey it.