I can make that assertion about questions and doubts for the following reasons.
First, God’s command to love him with your mind allows you the privilege. Ask any question you want. Second, God’s Son, exemplified the gift of answers to seekers and non-seekers, searchers and challengers. Feel free to ask any question relating to your salvation and eternity. Third, what God says is truth and the nature of truth is to adhere to itself. Whenever a claim is made, it voids counter-claims. You must know why you believe what you believe. Do you? Would you rather believe something that is false? Please don’t recommend what you believe to be false to others—you are in a personal contract to believe what is true rather than what is false; and you ought to practice social courtesy to not leading others astray.
Therefore, pursue questions of clarification in the areas of the truth, salvation, and counter-claims.
Intellectual growth assumes you ask particular kinds of questions. God has built you with the capacity for questions. He doesn't want you to be gullible. Your mind is part of your personhood and humanness. Therefore, use this capacity to study and investigate all truth.
Let's reach for truth as we reach for life together. God encourages, welcomes, and answers honest questions from any person.