In Srimad Bhagavatam, in the discussions with Kapila Muni, it is said that doubt is a symptom of intelligence. So this is interesting, doubt as a symptom of intelligence. We always thought that doubt was a symptom of faithlessness and so on. No, an intelligent person will inquire and will not just blindly accept. So doubt is alright and pure devotees are there to alleviate doubt by their own personal example.
This is a very important point and this is why I call Prabhupada the shortcut. See,