As far as our body is concerned, we do not have direct control over the immune system. By eating certain foods, we challenge and threaten it. By eating other foods, we reinforce it. By exercising, we give it a tremendous boost. The same is true on a spiritual level.
Some people live on a mental diet that is very dangerous to their spiritual health.
They read hate literature. They constantly focus on the negative. They dwell on disaster and conspiracy theories. As a result, their minds are constantly being assaulted by hatred and fear. He has noticed how people, by watching or reading the news, will ingest dangerous levels of toxic ideas.