The fifth chapter of Galatians presents a major contrast. Throughout the book Paul has presented the case on how a man is justified. In the fifth chapter he is laying out a new way of living. This new way of living requires a choice.
The choice is whether we will continue to live after the works of the flesh, which is characterized by all sorts of sinful activities and attitudes (just read 5:19-21). The other option is to live by the Spirit. Living by the Spirit means we will produce the fruit of the Spirit. Love, Joy, peace, patience, kindness, goodness, and faithfulness are what characterize our new life.