The advantage to being constantly controlled by the Spirit of God is in what are called the fruits of the Spirit. These are love, joy, peace, endurance, patience, kindness, goodness, faithfulness, and self control. When you have these things operating in your life, you will know for sure that you have been born again by the Spirit of God. Every believer is also a priest with direct access to the throne of God. When you pray to God he hears you, and you can be assured that he will always act in your best interest.
Spiritual growth is a life-long process, with many ups and downs.
Imagine the honor and privilege of being a useful tool in the hand of the Almighty God, serving him in gratitude for what he has done for you. Constantly maintaining your fellowship with him will be the way to guarantee your readiness for his leading. Therefore, do not be discouraged if and when you fall. Just repent, confess, get up, and keep on walking. This is what God expects of you in being able to handle your sins.