We already know what the works of the flesh are, which consist of everything that displeases God, and we already know what the fruits of the Spirit are. Both are the opposite, one produces life and the other produces death. Which one do we choose?
The apostle Paul wrote to the Romans about this:
5 For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit.
6 For to be carnally minded is death; but to be spiritually minded is life and peace.
7 Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.
8 So then they that are in the flesh cannot please God.