One percent doubt is zero percent faith.

There is nothing more dreadful than the habit of doubt. Doubt separates people. It is a poison that disintegrates friendships and breaks up pleasant relations. It is a thorn that irritates and hurts; it is a sword that kills.

Focus more on your desire than on your doubt, and the dream will take care of itself.

But then arises the doubt, can the mind of man, which has, as I fully believe been developed from a mind as low as that possessed by the lowest animal, be trusted when it draws such grand conclusions?

Doubt everything. Find your own light.

If we lose that sacred fire - if we let it be smothered with doubt and fear - then we shall reject the destiny which Washington strove so valiantly and so triumphantly to establish.