Leprosy is symbolic of sin. The 10 lepers acknowledged their condition. That sin caused them to be afar off from the people, which is the same thing sin does to us. It puts afar off from Jesus. Because they could not get to Jesus because of their disease, they cried out to Jesus. And because they cried out Jesus healed them of their disease. Jesus is wanting to do the same thing for us today. Even though you feel you are too dirty to get close to Jesus do as the lepers did, cry out to God he will hear your faintest cry and He will surely answer you by cleansing you of all your sin!