This means the direction of our life is away from sin. In no way would we gladly continue in sin and hold to habits without remorse. To do so is out of character. How could he be a coward when God had put within him a different nature through faith. We now deal with the positive aspects.
Christian life is positive.
There's a story told of a pastor who majored on negativity and legalism. On one occasion he took the morning service and defined a Christian on the basis of what they don't do but never included the Gospel of Jesus to covert the heart. No donkey can be a Christian. If we never include the Gospel to convert, then there's no power of God to save and make us different. When we come to Christ, he takes an empty vessel and fills it with Himself and that includes all His holiness.