Walk by the Spirit - Galatians, Part 11

In order to do God’s will, we cannot rely on ourselves. Thus, Paul tells us to walk by the Spirit! But what does he mean with that? How can we walk by the Spirit? 

Galatians 5:16
But I say, walk by the Spirit, and you will not gratify the desires of the flesh.

Galatians 5:25
If we live by the Spirit, let us also keep in step with the Spirit.