Doubt is the vestibule which all must pass before they can...

Doubt is the vestibule which all must pass before they can enter into the temple of wisdom; therefore, when we are in doubt and puzzle out the truth by our own exertions, we have gained a something that will stay by us, and which will serve us again. But, if to avoid the trouble of the search we avail ourselves of the superior information of a friend, such knowledge will not remain with us; we have not bought but borrowed it.