Unlike pure reason, wisdom is experiential. Experiential wisdom requires that we doubt and sometimes make mistakes.
Belief alone does not necessarily lead us to wisdom. Wisdom must gestate. Confusion and restlessness can be the pangs of new birth. Even our worst mistakes provide broken shards to make a beautiful mosaic out of our lives.
Doubt is just as important to the life of faith as is belief. Belief and doubt are the two wings that, in tandem, give our minds the capacity of flight.