Complex physical/mental attributes.

The human being is overwhelmed by the complexity of the physical body and overestimates his/her grasp of the complexity of the mental body. No one is as smart as they think they are.  

Illness = Mental Illness?

Does it surprise you that someone who is habitually angry, habitually anxious, or some other habitual negative emotion may eventually, because of that mental condition, suffer a physical one?

Environmental triggers.

 Robert M. Sapolsky said (I believe) that the human DNA contains susceptibility to various ailments. However, an environmental trigger may not turn on one of those susceptibilities. Many possible ailments stay dormant because they weren't triggered! 

Large unconscious effect.

 Which spatial body has the most personal effect? The sun, the moon, the planet: Venus, Mars. Jupiter, Saturn, etc. I guess they all do, but the planet that has the most effect is the one we're on. What is its effect?