What does Spiritual Perfection mean? It means that if we are led by our spirit, we literally will not sin.
The bible says when we accept Christ into our lives, it is no longer us but Christ living in us and we are saved from sin.
But people also fail to see that in spirit, with have also conquered death. So in truth, with Christ in our lives, we can conquer everything only if we are spiritually led. But don't get this perception that conquering everything is doing anything. We are still humans and if we are spiritually led, we are able to do the natural stretched to its maximum, not the supernatural because our body is still very much natural.
But that aside, it also means that we have the ability to conquer all circumstances and situations in our lives if we seek God first and be led by our spirit.