Walking by the spirit is just living a life in the spirit. It's living your life in the continual presence of the spirit of God. Jesus put it like this in John 15, that we need to abide in him, basically the same thing. If we abide in Jesus, the spirit is working within us. So as we abide in Jesus Christ, as we abide in that vine, as a branch abides in the vine, the Holy Spirit is pulsating the sap into our body, if I could put it that way. And he is producing then fruit in our lives. But as Jesus said, "When I'm separated from that vine, I shrivel up and I die."
So walking in the spirit is a God consciousness. It's having Christ foremost in all your affections. It's pursuing God with all of your heart, as we're commanded.
Now hear this message and be blessed...