You cannot live in sin and expect the blessings of God. As you give your time and attention to spiritual things—the Word of God, prayer and fellowship with the Lord—you will hear the Holy Spirit.

You will hear His promptings and He will show you how to walk in the spirit. But you have to dedicate yourself to God. You have to think about Him. You have to sow to the spirit.

Be not deceived; God is not mocked: for whatsoever a man soweth, that shall he also reap. For he that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the spirit reap life everlasting.
(Gal. 6:7-8)

Have you been getting thoughts like, "I need to spend more time in prayer," "Watching all this television isn't good for me spiritually," "I shouldn't talk about people that way"?

These are the promptings of our spirit let by the Holy Spirit. He is pulling you aside from the things of the world. He is leading you to give God control of your life.

Once you begin to respond and obey those promptings, you will notice that directions get stronger and easier to discern. The voice of your flesh will get quieter.

The Holy Spirit in you bears witness with your spirit that you are a child of God and a joint heir with Jesus Christ (Rom. 8:16-17). That means that as a born-again believer, you have the life and nature of God in your spirit right now. Notice that this witness is in your spirit, not your mind.

You have the ability to walk in the spirit on this earth in glorious liberty. You don't have to wait until you get to heaven to live free from evil. Jesus prayed that the Father not take us out of the world but keep us from the evil in the world (John 17:15).

Because the creature itself also shall be delivered from the bondage of corruption into the glorious liberty of the children of God.
(Rom. 8:21)

The glorious liberty of the sons of God is walking in the spirit!

You must however, commit to that liberty. You cannot enter into it halfheartedly. You have to sell out to God and give Him your whole heart.