As Jesus was asking the Apostles what the world thought of Him, it was clear that they had been exposed to the world’s view and its erroneous claims about Him. They shared the false claims they had heard, that Jesus was one of the prophets, or John the Baptist, or Jeremiah, etc. Seeking to distinguish the philosophies of men, from the truth, Jesus then asked his Apostles, who THEY thought he was. Peter, in great power, set aside the doctrines of men, and bore a powerful witness that Christ was the Son of God, which Jesus then affirmed to be the truth as revealed by His Father. (Mathew 16) Peter chose to not give way to the flesh based bias popular among the people of his time and to rely upon the witness provided by God.
Doubting our doubts means to avoid the tendency to favor the doubts under a guise of neutrality. Since doubts seem to take on a desire for self-preservation, they and their sources, will always seek to de-legitimatize evidence, facts, counsel, teachings, etc, that in any way may threaten their existence. Some who struggle with doubts can be lead to engage in forum shopping. That is, they openly seek sources and input that justify their having doubts, or which lend credence to those doubts, while simultaneously shutting down, avoiding, even censoring contrary views that would provide ample reason to doubt, or even dismiss, those doubts.
That bias is exemplified by one suffering with doubts who automatically questions or shuts out the witness and teachings of a righteous, good, and noble parent, (a parent who abhors lying and who loves selflessly), but who then turns and willingly consumes every word of the writings of an angry, flesh reliant, critic whose bias is obvious and whose agenda is clear…OR…the professed seeker of truth who will readily read and ponder over every word of a flesh based history which feeds their doubts, and then avoid, cut short, or even censor the explanations, clarification and counsel from a book or sermon given by inspired religious leaders whose teachings challenge the sources of those same doubts or the methodology which gives the doubts power.
Just as evaluating the credibility of the sources that cause our doubts is vital, so to is avoiding a pro-doubt bias. To enhance our ability to doubt our doubts we must always be open to good, honorable, selfless, sources as much as we are leery of selfish, agenda driven, or angry sources.
One example of doubting our doubts by choosing to avoid the pro-doubt bias would be to recognize a flesh based history as necessarily flawed, and to read it with a healthy skepticism, while carefully listening to, and considering, the thoughts and counsel of those whose witness and purpose is to reaffirm faith and whose motivation is love. One may choose to favor all who point to a perfect God for resolution of their doubts, while doubting those who offer only fleshy, fuzzy, relativistic human reasoning as a method to finding truth.
Applying the parable of the two wolves fighting within each of us for dominance... to engage in a pro-doubt bias is to feed the wolf of doubt, while starving the wolf of faith. It is good for us to remember the grandfather’s answer to his grandson’s question about which wolf will win……"The one we feed”