To walk by the flesh is to live leaning toward sin and impurity.  To walk by the Spirit is to live leaning toward righteousness and holiness.  Let God do a deep work in you so that you can be a soul that leans toward God and good.  His Holy Spirit has come to live in you for that very purpose.  “Do not put out the Spirit’s fire.”  “Do not grieve Him.”  Let Him clean up your whole heart.  Let Him set you apart from evil and set you apart to the right and good.

“But I say, walk by the Spirit, and you will not carry out the desire of the flesh.” Galatians 5:16 (NASB)