We can either walk according to the Spirit of God, or our own way (the way of the flesh).
But how do you know the difference? How can you tell whether or not you're living out your will or God's will?
"And those who are Christ’s have crucified the flesh with its passions and desires." (Galatians 5:24)
"For to be carnally minded is death, but to be spiritually minded is life and peace." (Romans 8:6)
"For the flesh lusts against the Spirit, and the Spirit against the flesh; and these are contrary to one another, so that you do not do the things that you wish." (Galatians 5:17)