Constructive doubt
Adolescent incredulity is a very effective factor in the human development, provided it is accompanied by a sort of earnestness and faith in investigation and search. Only this sort of incredulity may be called constructive doubt. Although the function of doubt is to destroy all that we already believe and construction is connected with the search and investigation which we undertake after this destruction, but as we do not undertake investigation and research unless the unstable beliefs of childhood are destroyed we consider doubt also to be a participant in this construction and call it the "constructive doubt".