If historians are not skeptical, they are nothing.
Since historical reconstruction is a rational process, only justified and indeed possible if it involves the human reason, what we call history is the mess we call life reduced to some order. pattern and possibly purpose.
History will help to remedy intellectual faults such as excessive concentration on one line of thought, absence of understanding for other points of view, belief in simple solutions, lack of balance of mind, absence of an imaginative understanding.
When I meet a historian who cannot think that there have been great men, great men moreover in politics, I feel myself in the presence of a bad historian, and there are times when I incline to judge all historians by their opinion of Winston Churchill -- whether they can see that, no matter how much better the details, often damaging, of man and career become known, he still remains quite simply, a great man.
The future is dark, the present burdensome. Only the past, dead and buried, bears contemplation.