You do not want to live in a country ruled by people who never have any doubts. To have doubts is human. A horse has no doubts, a grasshopper has no doubts, an ant has no doubts. But a human being stops to think sometimes, and when he thinks, he hears a voice asking quietly, 'Are you certain that you are right? You must be certain before you pull that trigger. You must be certain before you put your knife to that man's throat.'Would God have given us the power to question if he wanted us to behave like grasshoppers and ants? I am sure God takes pleasure in all the creatures of the world, but I am also sure that his greatest pleasure is a human being who puts his knife away because he is not sure, because a doubt has come into his mind.
Najaf Mazari, The Rugmaker of Mazar-e-Sharif
doubt