Apparently Augustine of Hippo, after a mis-spent youth of carousal and debauchery, found intellectual and spiritual sustenance in various disciplines of the time (neo-platonism, etc.) until his meditative practices led him to Christianity. Then slowly, over the years, a dependency on reasonable determination gave way to faith: an all-encompassing faith in spiritual direction arrived at through prayer.
So, in fairly short order, Augustine tells us in his Confessions, he abandoned reasoned thought in the certain knowledge God would be sufficient means, a more than adequate guide, to see him through the lapses in faith that he and all who were invariably sinful-in-nature required to be worthy of salvation.
He apparently felt so strongly about this, about everyone’s essential sinfulness and inability to lead a truthful and honest life on their own, that he saw to it that the laity were subject to the whims and dictates of the church hierarchy. These innocents, were discouraged from seeking any sort of personal spiritual enlightenment through Bible study and prayer which was pretty easy to enforce since most of them couldn’t read anyway. Over the next few centuries this priestly authoritarian presence became tyrannical resulting in the establishment of inquisitors who burned heretics.
Maybe the lesson to be learned here is to beware of those who suggest to you: don’t think about it all too hard, just believe, have faith, God will provide. A pretty scary proposition, it seems to me.