One percent doubt is zero percent faith.

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.

Often, people just don't see what I see. They have too much doubt. You can't do your best when you're doubting yourself. If you don't believe in yourself, who will?

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.

Doubt everything. Find your own light.

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