Gurudev, what is the cure for doubt? How to deal with a doubting person?

Gurudev Sri Sri - There is no one solution for this. When you know that a person is very doubting by nature, then you will not trust everything he says. Doubt is also important in life, but only as much as salt in food. When it becomes too much, then it is a disease, it is called paranoia. When it just the right amount, a person stays alert and aware, and does not get into wrong company. So, just like salt in food, you cannot do away with it completely. But when it is more than required, then Pranayams and meditation helps.