And I may justify that quite easily from the Bible, by picking out a few verses from here or there which support my position. Or it might be a fearful material, which means I'm so afraid of being alone with God that I find all sorts of reasons to be too busy to spend time with him. Too busy helping other people, or too busy doing things, because if I stop and rest I tell myself I'm being lazy, or I feel bored. All of these thick black curtains, and many others like them, dilute God's healing light to a thin trickle. And if God's healing light can't get through, then dis-ease results.
Physical disease has many causes.
Infection, heredity, congenital, unknown origin, chemical pollutants and so on. Fortunately for all of us, there's an antidote - Jesus. When Jesus voluntarily died on the cross, he explored every aspect of that black curtain of sin. He suffered the pain, both physical and emotional, but he kept on going through that curtain until he reached the other side. He didn't shy away from it, or avoid it or evade it, but continued straight through, maintaining his integrity throughout.