…being filled with the fruits of righteousness which are by Jesus Christ, to the glory and praise of God.
All who are born again have been filled with the fruits of righteousness known as the fruit of the spirit revealed to us in Galatians 5:22-23. They are love, joy, peace, longsuffering, kindness, goodness, faithfulness, gentleness, and self-control. To bring that fruit to maturity we are told if we will walk in the Spirit we will not fulfill the desires of the flesh, and we will see these fruits manifest.
Once you are born again, your spirit being made new has all these fruits within it. That is why when we choose to live ruled by our spirit man, these fruits will be the result. One of the keys to walking in the spirit is to feed on the Word of God. Taking time to renew your mind to understand the new man within you helps to bring your old fleshly nature into subjection to your spirit man. This will help you to be transformed on the outside as your spirit man begins to take over.
A second key to walking in the fruit of your new spirit man is to take the time to listen to the voice of your spirit known as your conscience. Before you speak or act, if we will take the time to listen to this inward voice we will either have a check about doing what is not right, or a peace about doing what is right. This will lead us to obey our spirit man, and the result will be the fruit of the spirit. Walking in the fruits of righteousness will be the result of living a spirit lead life, dominated by our spirit and not our flesh.