In order to deepen our faith, we have to be able to try things out, to wonder, to doubt. In fact, faith is strengthened by doubt when doubt is a sincere, critical questioning combined with deep trust in our own right and ability to discern the truth. In Buddhism this kind of questioning is known as skillful doubt. For doubt to be skillful we have to be close enough to an issue to care about it, yet open enough to let questioning come alive.

Sharon Salzberg, Faith: Trusting Your Own Deepest Experience