This is why there is this warning of the leprous hand. The truth will save us. It is a sobering thought. If we profane the truth when we explain it away, then it seems quite likely that in some way, and to some degree, we have all profaned. And, to the degree that we have done this, we have made it difficult for the Lord to save us.
Truths teach that evils are wrong.
When we reject or twist a particular truth, we make it very difficult for the Lord to cleanse us of a particular evil. We have deadened ourselves to the healing power of Divine truth. Within ourselves there is a part of us which is being eaten away by those very evils for which we have made up excuses. In one sense or another, then, it could be said that we are all spiritual lepers. Leprosy could be cured.