(M)ysteries in fiction are seldom as insoluble as those in life, as most writers can't resist the lure of omniscience. - Dennis McFadden
We are continually faced with a series of great opportunities brilliantly disguised as insoluble problems. - John W. Gardner
The greatest and most important problems of life are all fundamentally insoluble. They can never be solved but only outgrown. - Carl Jung
There are only two problems in my life. The political ones are insoluble and the economic ones are incomprehensible. - Alec Douglas-Home