We understand that our actions speak louder than our words. We know this, and John the apostle knew it. This is why he drew the comparison between the liar who claims to be a Christian, yet does not obey Christ, and the true Christian, who is obedient to Him.
In the previous verse, John told us about the liar. He claims to be a Christian. He may go to church. He may even read the Bible. However, when it comes to being obedient to Christ, he takes a leave of absence. He wants to talk the talk. He does not want to walk the walk. This time, John tells us about his opposite.
John now changes the subject to the person who is obedient to Christ. John the apostle makes it clear that the person who keeps His word has the love of God perfected within him. Obedience to God is more important than many of us have previously thought. It is essential.
Obedience towards God shows both our love for Him and His love for us. It shows our love for Him, since those of us who love Him will do our best to follow Him and keep His commands.
Obedience towards God also shows His love for us. When a non-believer looks at us from the outside, they see a transformed life in the person who is obedient to Christ. They can see someone who has been so impacted by the Gospel that their entire life took a change from a destructive path to a godly path. This may just lead to their being open to the Gospel message. If we obey Christ, we may see more souls in Heaven when we kneel at the throne. If we do not obey Christ, we are sure to see the opposite.