But I say, walk by the Spirit, and you will not gratify the desires of the flesh. For the desires of the flesh are against the Spirit, and the desires of the Spirit are against the flesh, for these opposed to each other, to keep you from doing the things you want to do. Galations 5:16,17
To walk in the Spirit is to live a life pleasing to God. No one is without sin because we are all sinners. If we were perfect Jesus would never had to die on the cross for our sins. We should strive to take up our cross and that is the evidence we love our savior.