Our physical immune system is always working for us. Without it, we would get sick any time someone coughed on us, or we shook hands with someone who had a cold.
What most people fail to understand is that we also have an EMOTIONAL immune system. This is a gift from God endowed to all mankind, working behind the scenes to reset our negative life experiences and feelings. The problem is that we are always trying to meddle with our thoughts, feelings and emotional states. This is like trying to pick on a scab to make it heal faster, which Inadvertently makes it worse, causing more damage! There is no need to live in the past, it’s over! Our emotional immune system is already working to bring us to a place of healing.