You buncha "Catholic" Protestants, stop interpreting Scripture all wrong. Yes, God wants us to be perfect as our Father in Heaven is perfect. God wants us to stop sinning.
So let me rephrase what I said above in a less controversial manner:
In an instant, in a heartbeat, in the blind of an eye, we absolutely can stop sinning forever. What we need is full faith and full hope and full love, all pointing at God. However, it will be incredibly painful and difficult.
Running rather than walking isn't really about not sinning, it's about doing good works. The good works make our disposition closer to loving God and further from fearing God out of a servile fear. If we love God then we fear offending God, and our fear is filial.
So we can certainly run when it comes to avoiding sin. We can run in an instant! When it comes to doing good works, we need to walk for a little while, while our faith and hope and love increases, praying for them constantly to increase, and cooperating with every good inspiration God grants us in response to these prayers. As this goes on, performing good works will get significantly easier and we can and should do them, which is nothing more than cooperating with even more inspirations from God, which are the exact opposite of temptations from the devil.