This is an important goal in life. It depends on the degree to which our spirit is developed. If our heart and mind are well developed, we can easily overcome disturbances, otherwise we are easily influenced by the events of our lives. We should be able to control our circumstances, not be controlled by them. When we lose control over our circumstances we get angry and our health is impaired.
Perfection means being able to control our environment.
God created us to be lords of creation. This doesn't just mean nature, but our lives and our relationships as well. We should be able to overcome all negative influences. When our spirit is mature, we will be able to overcome all difficulties so they cannot affect our health. Being a lord of creation requires being able to control ourselves.