How to get a faith that never shakes?

Question - Gurudev, how to get a faith that never shakes?

Gurudev Sri Sri - If it is true faith, let it shake. Truth will never go, and if the faith is with the truth, let it shake. It will never get lost. In fact, you should doubt as much as possible. You can say, 'Don't doubt', only when a thing is not a genuine thing. If it is genuine gold, I tell you, go on scratching as much as possible. But if it is just rolled in gold, or gold polish, then you say, 'Don't scratch too much because it will disappear.' With true gold, any amount of scratching will not make it go away. Doubt is simply lack of energy. When you are high in energy, where is the doubt? Doubt comes when the energy is low. True faith is that which you shake a 100 times and it still stays on. That is true faith, and it will remain.